people who park their carts diagonally across a grocery store aisle so they can talk to a friend they happened to meet up with, effectively blocking anyone else from getting through the aisle
I am nonaggressive enough that I've gone without buying stuff I wanted in that case
Oh. I’m super aggressive passive on this. “Oh hey. I’m just gonna move you guys over because I need some frozen potato’s cool great” and physically scoot them out of my way
Politely and gently
depending on the person I may smile deferentially and say "um, excuse me, can I just get in here, I need to grab something" but if it's someone who seems angry or something I don't bother
That's an invitation for bumpercarts or an obvious repositioning of the offending cart with a loud enough harrumph they notice bit not so loud as to make a scene.