I will never mind a "Hey, you misspelled «X»". I can agree "Ha, he misspelled «Y», he's such a complete moron" is annoying/disruptive, but I don't think the answer to assholes is to stop caring about basic grammar rules. Incidentally, as an outsider I've never seen people being as careless/clueless with their language as British/American people are. A result of the education system or society, maybe.