LGBTQs have been a specially targeted demographic group both in the U.S. and abroad, if you haven't noticed. Their rights and even physical safety have been attacked for a long time. Flying the rainbow flag is a good way of showing that the U.S. supports human rights and is against scapegoating, a practice of evil people that has caused so much misery and death to so many innocent people in so many demographic groups throughout the centuries.
I don't disagree with that but now it seems they are going overboard. It is ok to be gay or a trans, but there is no need to be flying flags about it. That seems more like an agenda then anything. People could really care less about their sex lives.
It's only during Pride Month. I get what you mean, though--do they fly flags for Black History Month? Women's History Month? Hispanic Heritage Month? Is there a month for Asians? Jews? Do they all have flags?
I'm kinda old fashioned about our flag. I like to see it at the top of the flagpole, not at halfmast all the time. The state flag included at state institutions and at embassies the flag of the host country is reasonable, but I'd rather see a big banner on the embassy wall, kind of like a giant poster, honoring a special interest group during their official month, instead of flying them on the flagpole. That's just me though.