If you go to an individual and tell them they need to “get their act together”, you’re being confrontational. If you make an equivalent statement about a group of people referred to as a third party, it’s not nearly as confrontational. Do you really not see the difference between these?

You probably don’t feel bad saying something like “McDonald’s burgers suck”, but if you tell someone who invited you to a cook-out that their burger sucks, you’re an asshole. Context and audience matter.

And people very much do talk like this is real life. People who understand context and audience can do so just fine.