It's one thing if it's hectic and they're busy trying to keep others alive, but yeah it's very annoying when you're lying there dead and you can see a cleric just goofing off or something.
I don't think age is really a determining factor in it though. Some ten year olds are probably more capable players than some of the teenagers and adults that just seem to get a kick out of being a jerk and purposely sabotaging things. It's one thing if someone just honestly doesn't know what to do or how to do it, but the people that really irritated me were the ones that knew exactly what needed to be done and refused to do it. Kingdom Quests should have a way for all members to vote and kick someone out if they're trying to cause it to fail.
-As for all the cussing... As far as I know there are no rules against cussing on here. It's really a simple matter of respect and maturity, though. There's no rule against it so you can speak freely, but that comes with the hopeful understanding that people will be mature enough not to abuse the right. Your first post would probably not have been any issue, but then once something was said in reference to the language you began purposely, pointlessly and excessively cussing.
So yeah, no rules against it, but know that in the eyes of most people it's rude and excessive use just makes you look like a fucking idiot.
