Some people seem to have a great deal of disgust for some things/people and the great lengths they go to avoid them. Some people take a lot of time and energy pointing out some things out repeatedly and to differentiate themselves.
It's one thing to be different and another to completely wall yourself off from things. I'm not really into clubbing and there are tons of things I'd usually rather be doing or talking about, but I can appreciate it and have fun doing it. Similar things applies to dating.
What people think they want in a guy at one point in life is usually somewhat different from another point in life. I've seen many times where people are so sure they want X,Y, and Z in a relationship, but it's not until they venture outside of that circle do they find people they want. Not always, but it's far from rare.
though, by replying and stating these things, you are 'building' that image of yourself. you're defining it for you and for others on this board

it's one of many ways these self-images are built.