It's an 'offensive' poster that the person in the photograph is carrying - and obviously, he intends to offend. However, you're the photographer, not the protester - you're documenting (I presume) not demonstrating or protesting or voicing a political point of view. I believe that in the absense of any other information, the person who took down your photo made a mistake - but they have their rules, they can if they please, I suppose.
Now, if you posted a photo like that and went on at great length on your opinion of President Bush and anyone who voted for him, etc, etc, then yes, I'd find that pretty offensive. The difference is that you took a documentary photograph of a protester - and that I can certainly deal with.
It seems to be - without being drawn into a politcal discussion and taking NO SIDES here, that this particular US election is full of strong emotion on both sides - and a lot of moderation has flown out the window along with common sense - so posting something like this might be seen as incendiary - who knows?
I've been getting a lot of that myself - nothing to do with photography. Just things. I have relatives who come from a long line of Democrats who just assume that since I married into their family and they seem to think I have two brain cells to rub together, I must therefore find their 'amusing' jokes about Bush entertaining - I don't. I had a manager who told me that a co-worker was 'dumber than Bush' and I guess he thought I would laugh at that. I'm not offended by your photo - but I guess you can't just assume that everyone's going to like it.
Anyway, why did you post it? Just testing the waters, or did you see it as a legitmate documentary piece? Or did you actually want to put a hot poker down Repub's pants? (grin)
Best Regards,
Bill Mattocks