Just because people are stupid doesn't make what they are stupid about absurd.
My biggest problem with is that in a lot of cases we don't have free speech and while some restriction in certain aspects of society(school) makes sense, in others it doesn't. As well my other gripe(besides what the OP mentioned) is when people think free speech should be selected. I.E. I should have the right to state my opinion if it's against racism but those that are racist shouldn't have the right to state their opinion.
I hate groups like the KKK as the next guy, but I acknowledge they have every right to say what they believe just as I do.