
Goodness, I don't know if there is an easy way to answer this with out drawing fire down on my head. So I think I would rather generalize rather than point out a specific culture.
Cultures today tend to be so much more dramatic and intolerant of other peoples. Its not just one culture, like american culture, but many different cultures have become less and less tolerant of other people. Hating other cultures because they aren't like you, condemning other cultures because their beliefs contradict yours offends me greatly and with good reason. That being the case, most of the worlds current cultures offend me in this manner.
I don't however find a particular culture offensive in and of itself. Being offended by a culture is a sign of ignorance regarding their culture and society in my opinion.