Would make a wonderful excuse when a gay person decides he wants to be an asshole.
"Goddamn it dude why you being such a dick?"
This is the perfect example of Pride going too far.
That isn't pride, that is othering and gross generalization. Pride refers to an assessment of one's own value and accomplishments, whether taken too far or not. The argument being presented is that people under the LGBT umbrella are normally deemed of lesser value by society (less extremely than ever but still), while straight people can feel comfortable in their existence and self worth. Being proud of being gay and having that self worth does not justify belittling others. That isn't to say some people don't use that as an irrational and wrong argument for being a bellend to straight people, because humans are such wonderful exemplars of rationality and logic. With enough stupidity, any valid argument can be used out of context as a verbal bludgeon.
LGBT exists primarily for anyone who doesn't fit the straight cis norm, as an activism focus for civil rights. It allows people to be a part of a group or collective instead of the other or outsider in the normal collective of society. It should serve as an identity to bring a sense of belonging and unity of purpose, but after the gays got most of their rights people started turning into the boys club, girls club, and "WELL YOU ARE IN A STRAIGHT RELATIONSHIP SO YOU AREN'T REALLY BI", and "TRANS WOMEN AREN'T REALLY WOMEN!", etc. Whatever unity that civil rights movement had really has begun to go into decay, as individual identities split off into their own cliques. And nobody wants to go to a parade for inclusion to be told how much they don't belong.
As a period of celebration and awareness it works, but some parades are probably guilty of turning it into borderline kinkfests. While some countries probably need a kink parade or two *cough*UK*cough* a lot of LGBT people are actually put off by that, about as much as furries are put off by people who wear kink stuff to general furcons.