Why is it???

So I was reading some comments on a post about anal... Lots of people are saying that those who don't do/like/enjoy anal is because they are insecure, trolls, or uptight... Why do you have to resort to putting down others just because they choose not to do anal or don't enjoy it? Why can't you just leave it at the don't enjoy it. Not everyone likes it and that doesn't make anyone less secure or a troll or uptight etcetera...