I would probably just sum it up to say, "if you need to grow up, you need to know how to take the heat and handle it."
I guess when I saw your title I was like, "what???"
But then after reading through I realised that you are trying to point out the 2 extreme groups of positivism and negativism individuals (or rather groupies).
Toxic people to me are those who are not willing to get out of the extreme negative which pretty much who you pointed out - obnoxious people; but though I hate negative stuffs I learn to welcome debates and point out the facts and deal with the problem instead of listening and obliging.
That is iron-sharpening-iron for me these days.
Good post. I've upped one for you.