People don’t quit jobs, they quit managers and coworkers. In my case I’d quit some coworkers and sometimes my manager.
But others coworkers are good ones I like working with, and the workplace is not very far, meaning my commute is so small I can bike there. There’s lots of downtime as well and sometimes my biggest trouble is how not to die of boredom listening to my coworkers’ boring stories because they feel offended if I don’t sit with them. I’m unionized.
I like keeping to myself and deciding what kind of people I want in my private life. Most of my coworkers are not this kind of people. I’ve been called a loner, which is actually true and it’s not a problem unless people bully me for it (because they feel offended by my silence, apparently). My biggest problem is office drama. However, wherever I go, there’s always going to be drama, so wouldn’t it be wiser to stay with the bad I already know?
I don’t get drama. It’s a waste of everyone’s time.
If you’re asking how to find the “mental fortitude” to stay, it’s probably better to leave.
Also for what it’s worth, most of my jobs have been fairly drama free. Some of them have still been utterly shit for other reasons but there doesn’t always have to be drama. You’ve got a weird lot at the moment, a coworker who keeps to themselves is usually a plus not something to get upset over.