A couple weeks ago I watched a biopic on Babe Ruth, and they documented his first marriage in the film. Babe was like someone who liked to go out all the time, whether it was to drink and dance or go to the movies and grab a bite to eat. He liked to be out an about with other people. His wife, on the other hand, liked to stay home and tend the farm. She liked quiet evenings sitting in her home curled up by the fire with a book. A "loner" you might say.
The relationship did not end up working, and they split up. It wasn't because Babe didn't like his wife, in fact the film showed him caring very deeply for her and liking her quite a bit. But the relationship didn't work out because they weren't a good match.
Now I know that film was a dramatization and should be taken with a grain of salt, but I think the idea that people with very different personalities may not be a great match can hold true. I don't think 'normal guys' look down on 'loners' (most of them at least) but they may recognize that s relationship may not work out between them. I know if I dated someone who wanted me to go out and party every night would not go well at all - I wouldn't want to.
I would say, if you're happy with your 'loner' status, I think there would be someone out there who shares the same mentality. I for one prefer being on my own most of the time, and I know I'm not the only guy in the world who feels that way. Whether or not guys like me are "normal", well, is anyone really normal?