On at least two occasions some advanced MO users included in their comments phrases which were less than polite. I hope that these are isolated instances or else I would quietly and simply leave MO without a word. I don't know if these were the cases of autism or because their English is poorer than mine (I doubt it--my own English is poor enough).
If people would leave MO because they value politeness above MO imperfect manners then whom are the advanced users going to pester? :-)
PS. At this time ( 2014-11-22, h.22:06 of the USA Central Time Zone ) there are $\ 5\ $ up-votes and $\ 8\ $ down-votes (like they were needed in this case :-) -- one may wonder who is who? It's ironic that a simple request for being polite causes such a downpour of excitement.