What makes them so, so triggering?
1. Stressful.
Being stressful, filling the stress cup.
2. Somewhat worse? They’re DESIGNED to be stressful. As that makes most people spend more money, & buy more things, to self-soothe. (And if you’re at all sensitive/wary to overt manipulation, forced cheerfulness, or “sated” people? It’s going to set your hackles up.) The disassociation that even normal people experience in supermarkets, is kinda thentrefecta for smashing the

ALARM! BEWARE! ALERT! ACHTUNG! PELIGRO! DANGER!

button.
I’m faaaaar better with markets, bazars, & suks… even though all 3 are so much “wilder” it’s a natural wildness, rather than the artificial one Supermarkets employ; with blazing lights, loud colors, psych profiled marketing, mostly terrible music, aisles juuuuuuuust too small to let people pass each other without touching / crashing their carts, carefully analyzed “what makes people spend the most” organizing, rather than sensible organising, etc., etc., etc..
I’m perfectly fine with Restaurant Supply (acres of brown & white boxes, with only a small sticker indicating the contents), and Costco is peaceful if you don’t have to deal with all the stressed out people (As Costco skips all of the shouting colors & branding & psych-profile-marketing stuff at supermarkets keeps most people docile in supermarket stress; as they’ve got comfort in arms reach, they just keep reaching, and reaching, and reaching… subtract that and you get the angry-Costco-crowd), or if stressed out people is actually soothing TO you, like it is me. (Everyone with fake smiles plastered on their faces? Too loud voices pealing across aisles? Makes. My. Teeth. Itch. But I’m super chill when everyone else is freaking out).
***
Having kids was what finally made grocery shopping fun/easy. As firstly my focus was entirely on them, and making things fun, rather than OMFG

Noooooooo. Who needs food? I hate food. Food can f*ck right off.

And secondly? Being able to go to the grocery store
without kids, was almost like vacation.

Again, though, because my focus was still on the kids (their not being there, this time, meant I could move fast) rather than swirled into the black hole of shopping.