I dislike it when you give out your opinion, get yelled at it and then people saying that they have opinions and SAYING your opinion is dumb or something. :/ I like having opinions, but sometimes I come out at it in a rude way.
There's also nothing wrong with challenging someone's beliefs with your own, or asking them to explain them. But some people are just too stupid and narrow-minded to actually do it and just whine about being "offended".