I'm not super confrontational by nature, but I'll do it if I don't have much of another option, or I'm just at the end of my rope and no longer give a shit about my own standards of social politeness. Most of the time I directly cut between them and whoever they're talking to, with a semi-loud and curt "Excuse me" as I just barrel on through. I don't give a fuck if I interrupt their conversation and end up being rude, they shouldn't be having their conversation in the goddamn doorway, the ONLY doorway in and out of the place on that side of the store. So they deserve it. There was one time I was leaving the store, stuck behind a fatass leaning heavily on their cart, and they stopped right in the middle of the sliding automatic doors, like, DIRECTLY in between the doors, to check their phone. No one could get in or out around them. I was with my shitlord husband and said to him "Of course, this is a GREAT time to check your phone! I wonder what could possibly be SO important that they have to hold up every single other shopper. It must be good!" The fat sack looked over it's shoulder at me, I shrugged and tapped my foot while waiting impatiently, and they slowly, ever so slowly, lumbered the rest of the way through the door and proceeded to block the indoor cart corral continuing to look at it's phone, preventing any one else from getting a cart. I absolutely could NOT imagine doing that to people, just being in the way and knowing everyone who looks at you hates you for your very existence and how you just get in the way of everything. How fucking entitled do you have to feel you are to do that?