They know it's offensive. That's why they do it. You can't object without looking like the bad guy.

You can't have a "country fair" and not invite the homos. They'll say they're entitled to a booth just like everyone else. Deny them and they'll sue and maybe even win, or create a big public stink and make your event toxic.

The second point is indoctrinating children. They see people pissing off their parents and getting away with it. The gays must be so cool!