They rely on me to use their store so they can get paid. If I think the service is bad, I won't come back, and if enough people think that, they'll have to close, and everyone loses their jobs.

I don't care how hard someone is working or struggling or whatnot, I just want to get my stuff and get out as quickly as possible with minimal fuss. Hate other customers that cause shit same as the workers since it makes my day harder as well, but it's still not an excuse for bad service.

The thing is you are right, the service industry is essentially you providing trivial bullshit to people who are willing to pay for it. It's one of the first to go in a shit economy, and it's also one of the easiest for your customers to simply decide they aren't happy and fuck off and not come back. I've got sympathy for the type of asshole customers you have to deal with but that's the nature of the job, if you're giving bad service in response it will kill your business. I've tried so many new restaurants that don't understand this and they invariably fail. When I'm going to spend money on non-essentials in the service industry, if the general vibe is bad, I don't come back. Doesn't matter who is right and who is wrong. The customer is god because they're the ones paying your salary.