If you read the OP, that was the point she was getting at. Everyone here has varying views on the positive or negative natures of their singleness. People are just talking about how we "wish" we could respond when asked the question instead of giving a polite response typically given.
In that case:
Because I don't want you to try to turn me into your idea of the perfect man. I am who I am, I come as I may and if I need changing, you should make a play-doh man and he can pay for your dinner instead.
Because I like being unshowered and unshaven sometimes, and it makes you look really fake when you pretend not to do it too.
Because dating etiquette is pointless, and spending four months setting the bar way too high to sustain is not my idea of romance ... at all.
Because my toothbrush is
my toothbrush.
Because sometimes I'll pay gadgets more attention than I pay you.
Because I'm really not interested in having to contend with all your friends' opinions on our relationship as well as yours, nor in having to contend with complaints about all that stuff their boyfriends do that I don't do.
And because honestly, it's really
not fun going shopping with you.