You don’t want to sound too condescending. Or, this may be a way for you to somehow soften the blow. After insulting someone, you put a smiley with his tongue stuck out at the end of the sentence. Well, let us tell you that people can see through this. It doesn’t soften the blow. It only makes you look phony. Your being ironic is actually not witty. If you have something to say, say it outright. Don’t hide your true opinion and expect people to take it well. If what you have to say sparks debates, then go ahead and let people argue. Now that’s actually a lot more interesting.