First of all I think you're very BRAVE and it's really GREAT of you that you even went out for a date (or something like it) with a girl with cerebral palsy or such..
(Even if it was 'horrible' maybe she doesn't get to go to that many dates and you actually gave her some really good moments to remember...!!)
Second of all, if that's you in the avatar, you're really good-looking!! (Maybe you just don't really know it yet??)
So she may have been scared out of her wits sort of, and said stupid things! (Or may have Tourette's syndrome?? You could ask her about it next time??
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So basically you went out like with a friend, and possibly she expected more.. (The '3rd grade' comment could maybe relate to how she was feeling, having a crush on someone, passing notes..)
The sarcastic and mean sense of humor can be appreciated by some, and not by all.. Sometimes the teasing can be friendly, yup.. It's sometimes not so easy to recognize it though. And sometimes the boundaries can be non-existing or difficult to recognize, between just joking or actually hurting someone..
Maybe she is also not used to talking to shy/SA people.. (?) And thought if you really liked her you'd talk to her more?
Honestly, I think she was maybe just fishing for compliments? For you to say, 'No, it wasn't that terrible..' or joke back, 'I'm tall dark and handsome, what else do you want?' or something like that?
Maybe with 'advice for next girl' she also wanted to point out she felt there wasn't chemistry, and for you not to feel bad about it?
This is one of the reasons why it's probably better if the guy makes the 1st step.. Unless it's explicitly stated it's just friendship/hanging out or such..
Maybe it would be good to reply something like 'I like you as a person/as a friend' to make it clear from the beginning, if you didn't have any other intentions..
Us girls can expect too much if someone says compliments or things like 'I like you' or pays attention, especially the girls that maybe didn't have opportunities to hear those things so many times..
And even SA girls can sometimes not really understand guys with SA.. (for example why don't they talk to you if they like you, it can be frustrating!!)
Lots of dating is about getting to know each other, and now at least you know what type of humor and personalities you like/don't like..
It was rude what she said, though maybe she's used to hanging round with the sort of people who'd use this as a brilliant comeback.. something along the line of Pride and Prejudice and the lines in some comedy sit coms or plays.. (Or more rude and direct people who'd say 'Oh no, I totally dig your ...')
And yes, girls do like to know what you like about them (=fishing for compliments or things you might have in common to build upon) even some boyfriends don't get that stellar about it though.. Next time, do take time and find some things you like about a girl before you go out with her to tell her if she asks you.. With the fashion industry, big expectations and everything, girls can get very umm.. fragile self-esteem.. so just saying honest observations about what you do like can be very happy-making..
sorry for the non-english expression..
So if you do like her and want more with her, you could ask her out 'for another terrible dinner' or just joke about it.. (Like I said, maybe 'I thought you were cute but didn't know you have Tourettes' or something) Though if she really liked you and her heart was broken a bit, then maybe dry humor will not be enough..
If you don't like her, it might be a bit awkward if you hang out with common friends, they'll probably understand though.. 'Sorry, I'm shy, she crushed my SA heart...' (?) It may be easier if you throw in a compliment for her too.. so maybe she will learn from the experience too??
It can feel horrible to sort of 'break someone's heart' or be told bad things.. I think both you and she may have learnt something from this... (I hope!)
I think maybe she really liked you and thought she could 'be her real self' or even tried to impress you with her sense of humor (?) maybe she just wanted to make you laugh, as she might feel this was one of her strongest points with friends or so.. (I know sometimes girls among other girls can laugh a lot, and it may sometimes be 'too much' for new people or guys who don't really know us..)
Did you joke with her initially? Then maybe she just thought you were a great guy with a sense of humor.. and didn't realize you were feeling awkward until it was too late?
Cerebral palsy can sort of have brain complications too.. I have a relative with it, and he looks normal (and very cute too), his brain just doesn't work
quite okay some of the time.. He can be kinda long-winded too, and say the same things over and over (actually whole of his family is kinda like that though, even with very boring everyday things, it's because they don't go out among people much..
So, I think you were brave for bearing it out!!
Please hang in there!!
If/when you get married, this can be one of the stories you tell, 'before I met your mom'...!!