This has nothing to do with '20s behavior'. I have seen levelers leave groups after wipes or arguments with other party members hundreds of times. After all, it is just a game, not a job or some social duty, where you should feel bad or immoral for abandoning 4 random players for the sake of your own good. If you are not enjoying yourself, you should never feel obliged to do something. Especially when it comes at the expense of your own happiness and mental well-being. Doing the same thing over and over is never healthy. Levelers do RDF for quick xp, whereas we do it for a specific piece of gear. Levelers gain something from every RDF run, whereas we gain something only when a specific item from a specific dungeon/boss drops. I see nothing wrong in looking after yourself and rushing the annoying part of the proccess to properly enjoy the game and play it like you intend to when you think of 'FUN'.