I don't eat fast food regularly (weekly) but I do eat it a few times a month or sometimes when I travel.
I understand it isn't heathy, but so what, eating bad food a few times a month doesn't matter much in the big picture.
What I have noticed isn't 'teenagers' or even early 20 somethings that are working in fast food and doing it horribly. what I see are older people that failed in life, or what could be illegals, so what do you expect?
I love the self serve order menu and kiosks in fast food places. Talking to the average worker in a fast food place is like being punished for something.
I will no longer eat at Wendy's. I have been a several in several states, they are all run like shit. Poor quality control on the food (read not served hot ever) and the people suck, at any age, that work there. I used to work near a wendys when I was younger, ate it often back then, I gave it up it got so bad.
Taco Bell is hit or miss, some are run well, others not so much. I grew up on taco bell, will never give up the basic beef tacos. One look in the kitchen from the order counter and you know if the food is going to suck. Is it clean or not, if not clean then leave.
Popeyes, same as taco bell, hit or miss, depends on the store. You can tell the ones with an engaged manager that are well run
McDonalds, mostly bad, not just teens, people of all ages suck that work there suck, I have given up trying more bad than good. I grew up eating MCD too, but I am giving it up, can't find a good one anymore.
Subway, hmm, also hit or miss depends on who owns it. Have had a sandwich artist try to put BROWN lettuce on my sandwich. When I said something to them, their response was, all our lettuce always looks like that, I walked out.
Chipotle - I like it, varies wildly with regards to portion size being served. The one near me went to online orders only during covid and not sure if they ever stopped, but the online order you pick up has half the food in it than when you stand in line and watch them make it. Fuck them I had to go buy another meal after I got done eating what they gave me for $12.
This brings me to Chick-fil-A. Very consistent food, usually hot, friendly helpful staff and MOST OF THEM ARE YOUNGER people. I will eat at a Chick-fil-A if I need fast food over most any other. Not because it is great food, but the food and the experience doesn't SUCK like everywhere else. Averagely ok food, no one being rude, very consistent = win in that space