@NJ we live in a democracy. People are entitled to campaign for whatever they wish, however distasteful you personally find it.The reason we do not see calls for straight pride carnivals, or white police associations except on forums like these is because no one feels strongly enough to organise such things- as commented before, straights are hardly a demonised, victimised minority, and the same is true for white police officers.
And as far as Gay Pride is concerned - OG contends they are now equal - In law thats technically true, but, based upon comments from friends and acquaintances of mine that are gay, discrimination and abuse still abounds. So I can fully understand gay people who wish to celebrate their sexuality, with events like gay pride. If they were to advertise such events as for gays only, then you might have a point - but they do not.
If it makes you uncomfortable, don't look - but I fail to see why they should all tug their forelocks and creep around in the shadows simply to appease those in society who are disconcerted by the idea that other folks have a different sexual orientation.