"Don't be Negative"

Do you also know people who ONLY want to say "positive" things (what they call positive), like only talk about rainbows and sunshine, and cut you off any time they perceive what you're saying as "negative"?

I mean people who really take this to an extreme, and even start to blame people for all their problems, and think every single thing negative is a choice, and so it's hard to have a conversation with them?

I completely understand looking at the bright side of things, or not wanting to watch or hear about awful things of course. I understand a mom telling her child "don't be negative" when the child is growing up and such. But never being able to mention anything remotely "negative" means you can't solve problems (need to identify the negative to turn it around) and maybe can't even get to know a person or have conversations at times. Usually we'll have a mix of so-called negative and positive elements to stories or whatnot.

Thoughts?