I agree, OP. I think some people don't know the difference between honest, no-frills advice and being downright nasty. And you'll get lots of people on this very thread making excuses for that kind of attitude.
OPs ask a question, and instead of useful, practical answers, some pps tell them that they 'sound snobbish, awful, judgemental etc etc', but don't actually address the point they're posting about. Or pps make crazy assumptions, reading between the lines. If they're not going to take what the OP says as true, It's pointless to bother responding.
Also - the people who live on another planet where you really CAN just say 'NO!' to a friend or boss's demand. Yes, you can decline, but in the real world outside the MN bubble, No is hardly ever a complete sentence.
I think the really nasty responses come from very sad specimens of humanity who probably have little real social contact and use anonymous online platforms to vent their spleen against the world, so don't take it personally!