First off, I'll state for the record, that the kind of arguments and statements made by the poster seem to scream "These are my points, and if you argue them you'll be labeled a homophobe" and really do little to advance his argument. But I'll put what I percieve to be the poster's intentions aside, and give a legitimate answer.
Watch the independant film "The Celluloid Closet." For those not familiar, it is a documentry about homosexuality in hollywood, and how gay subtext has been quietly infused in movies throughout hollywoods history by gay and straight filmmakers alike. An example is Sparticus...the character played by Charlton Heston was gay....only they never told Heston this. They directed his perfomance to reflect the character's sexuality, without Heston ever knowing that was the intention. This came straight from the directors mouth, and is not the only example.
Now honestly...if this kind of practice is common in hollywood (and I'm not commending or condemming the practice), and Batman and Robin has a HISTORY of being associated with gay overtones (most notable by Dr. Fredric Wertham in 1954's "Seduction of the Innocent"), and the movie begins with gratuitous "butt shots" of batman and Robin suiting up, and the director is openly gay, how can you not expect people to get a "gay vibe" from the movie? No one is bashing homosexuality (at least I'm not) but you can't reasonably dismiss anyone who gets that feeling as a gay-basher.
As for the argument about "no one caring ibout gratuitous boob shots.." remember your target audience. This is a BAMTAN movie. If George Clooney was in the sequel to "Bridges of Madison County", or another movie clearly targeted at a female audience, and you focused on Clooney's butt, it would fit and no one would scream "gay." If they then focused on a girl's breasts in the same movie, that would easily be interprited as a "lesbian overtone" Batman is overwelmingly targeted to male audiences...a male butt shot is out of place...unless your attempting a bit of homo-erotic tonage.