I've never been called a 'loser' because that's not really something people say in the UK as an insult. As for freak, I'm not sure. However, I've been called plenty of other insults, or words/sentences intended in an insulting way.
Tramp
Psycho - whenever I stuck up for myself physically.
Greasy - Because once I went to school when I didn't wash conditioner out of my hair properly, which is unfair, as other girls did and never got insults for it.
I've been asked if I've got mental problems - heh, which I have.
Emo - Because people found out I cut myself.
Weirdo - For being quiet.
There's hundreds of other things, but I'd rather not think of it and list it all out.