No, and I believe you're taking things way too far. And we've all seen pretty mean SO rejection messages. It doesn't take much to be polite in doing so. If you're going to come back with, "What if I'm polite and they still think I'm mean," well, then I don't know what to tell you. I do know that the answer is not to add actual hostility to the site just because you feel that a few people might take expectations of politeness too far.