[sebazzz]

From what I've seen you can play the racism, gender or (in a lesser extend) religion card. That is because in that case you're clearly part of a group - and often a minority. It is however unclear if the ones who feel offended are also a minority within that group (but does that matter?).

In other cases that is less clear, but I've also not seen many people offended for other reasons than the three I mentioned.