Like I said, it was perfectly justified, that's not the point though...
What is the image that people see of GLBT people in the media? It's weird, crazy, juvenile, immature, etc.
When you go and reinforce "juvenile and immature," I don't think that helps. It just gives people more security in criticizing you. The message, in my opinion, is more serious than is warranted by dressing up like barbarians and throwing glitter in someone's office. That's basically on the level of a prank, it's just intentionally trying to be a nuisance. You never change anyone's opinion for the better by being a nuisance. Bachman & co. already use words like "barbaric," obviously this kind of thing just reinforces that belief. People's image of other people is changed by visibility, and by viewing those other people as people, operating as people.
Nobody except the extremely homophobic would take a place like that seriously in the first place. And doing this kind of thing certainly won't change the views of someone extremely homophobic. It might, however, be putting the wrong foot forward to people who are not really intolerant of, but also not really familiar with GLBT people. At a certain point, you just need to let it go and give it the attention it deserves: none.
