But meanings vary depending on region, education, political background.

Science, direct experience, is about as concrete as it gets.

Not any more apparently. Fascist, socialist, communist, alt-right, neoliberal, etc. just mean whatever they need to quickly slur someone with them. Hell ever Marxism seems like it doesn’t actually refer to anything Marx or his contemporaries ever said anymore. Did you know Bloomberg is a Maoist?

Fascinating how the site obsessed with their pseudo-intellectual superiority can’t add anything other than downvotes.

Imagine a discussion board where you could not use any -ism.

I agree. Unless we are talking about avowed actual Nazis or card-carrying Communists, much of this extremist labeling can be reduced to identify ‘enemy tribe members.’