I will admit I am fully guilty of doing it. But I really do try not to. Sorry to sound like a broken record here but I am sick of moral relativism. "Well that's your opinion", "Yeah, but it's worse in *insert situation/place/object/etc here*"...
I hate, hate, hate it! Especially normative moral relativism: "but that's not how things work" or "but people don't think like you". Drives me nuts. It is a really annoying attempt to refute an argument about how something ought to be simply by stating how it is.