Is it fair to say that "adulting" is mainly comprised of tolerating shit that bothers you to some degree?

I would say it's about taking responsibility for how you respond to it, tolerating it if you have to, changing it if you can, and, if you can't change it and it's too much to take, getting away from it. But just sitting and complaining needs to be kept to a minimum, though a little venting every now and then is okay.