To me, a visceral sensation of discomfort = squick. So I'm getting your reaction here.

I'd classify some things as "minor squicks", I suppose.

Torture, to me, is a full-on squick. I have to cover my ears and screw my eyes shut when surprise torture shows up onscreen.

Prison rape, too. I won't even see films which could conceivably have prison rape scenes in them - unless I've read the book first and know they won't.