As a dedicated LGBTQ ally who goes after anti-gay people, policies, and practices...I don't go anywhere near LGBTQ events/social media because there is so much behaviour policing directed at allies, some of it deserved, a lot that's not. 
I think the points made are mostly facile. Allies aren't a homogenous group. Some will be wonderful, some obnoxious, like Perry. But they are ALLIES and their mistakes carry far less danger and consequence than those of ENEMIES.  Serious, persecutory, often lethal danger is afoot globally for LGBTQ. The online mewling about costumes and pop culture linked 'controversies' or the right attitude an ally needs to strike at Pride?  Please.  Mike Pence is a heartbeat away from the American presidency. There are concentration camps for gays in Chechnya. The Perez Hilton-ification of LGBTQ issues online and related shots at allies is crazy.  
Plus, it fuels the Trumpian backlash when you slag people who get it mostly right.