Because homosexuals are gay, that's why
There is a huge difference in that group, beceause every person is different. Maybe he fits under the name 'gay', but that does not mean he will go on a parade half naked to show that off.
In my opinion, that parade is just a big '(fuck you!)' to the other people, that they can have such a parade while others don't.
It's lame and awfull to see, i don't get the point of that, honestly.
Still, NEVER pull all the people over the same line, You wouldn't love to be compared with someone else either.