I hope people don't blame people for laughing or joking, it would be like blaming someone for crying at a wrong time. A lot of the distasteful jokes are ones we laugh at, and then we never forget the internal feelings we had, yes I despise some jokes, but you hear and you remember. It is a part of who we are, to find a way to cope and to remember, it is like all other memory triggers, sometimes they are not pleasant.