My girlfriend wants to go to a gay pride event and I don't want her to go,
It shouldn't be a big deal, why don't you want her to go?
Events like gay pride are designed to mock the heterosexuals.
Ah, my friend, Pride is not mocking heterosexuals at all. They're inclusive.
Shut up... I'm not ignorant
Pride is a celebration of being oneself and a way of coming together with a community. There is history in Pride parades and it's incredible. There are some great books and series about the history of them, even down to specific cities.