I see that I'm not alone but still in the minority. And that's ok. I mean, it's something that's always happened, but happens 10x-20x more with the 20's twinks. I actually get surprised when one finishes a run (I'm just assuming he needs the last boss). What I don't get is that this community is generally very helpful online. Lots of guides, willingness to share wisdom & help, etc. then exhibit toxic behavior in game.
Because let's be clear, you can try and justify it to yourself however you want, leaving a random dungeon mid-run intentionally IS toxic and shitty.
So, for me, I will finish runs if I'm tank or healer, usually.
As dps, I just leave, not a big deal to find another dps.
If someone leaves, and it prompts me to find a replacement, sometimes I'll tell group, we can just 4 man it, ups loot chances for all.
However, if the group is toxic, or just terrible dps, shit tank with crap gear, etc. when I'm healing; then I'll leave in those cases as well.
Example: cleared Atal Dazar maybe 50+ times trying to get Disc to drop with gem slot on HPal, ...
If the group had issues with Rezan, usual 1st boss, or even just getting to Rezan, I left.
Not worth spending an hour and multiple wipes on trash, to carry group to end.
Some groups like having 20's or even 10's in group as tank, heals, etc, very fast runs.
Although, some levelers bitch that you are skipping trash mobs, less xp they cry.
One player raged at me, you FN twink, let's kick her, she's lowering our XP gains.
I told em to F off ... and they left the group.
Then everyone laughed when I told em I didn't have XP off and was just a f2p on a trial account...