Very cool. I love that cosplay doesn't really restrict people. As long as they love a character, they can cosplay as that character. I'm not much into it myself, but I always loved this part of the culture.
(There's fringe groups that take offense at people cosplaying as a character of another gender or race, but those are just that, fringe groups)
I can't stand people that want to restrict the creativity of others. Don't like it? Don't ask to take a picture with them and move on to the cosplayers doing what you like. Sadly, that is easier said than done for people in that fringe group you mentioned.
It's as simple as ignoring the people who offend you. Let them live their lives, and they'll let you live yours.
Very true. Though hecklers can make something that was fun become something that is more of a chore, or not fun anymore.