Let's say you saw someone attacking your trash cans and getting garbage everywhere.

You don't know what to do and go next door and say "this dude is acting like a lunatic" to your neighbor.

Is your neighbor going to assume you are making a clinical diagnosis of mental illness?

No; also, they most likely aren't going to care what word you used, because the problem is not your language, it's the guy literally getting your trash everywhere.

Lunatic is an archaic word that doesn't hold the power people posit it does.

In fact, most words that are not understood beyond a cultural meaning of "good, bad, or weird" do not have the power people on Twitter think they do.

And everyday people using them does not imbue them with power - particularly so.