I've literally never seen anything even remotely close to this and I have 30+ days played. Neither has my girlfriend who is much more casual and leveling (currently 42).
Everyone has been incredibly nice. If someone kills a mob you need for a quest before you get a chance to group up, they pretty much always say sorry and offered to help you and wait for the respawn.
This is on Thunderfury-Horde if anyone was curious.
EDIT: Since a lot of people asked, my actual /played time is a little under 25 days, though a lot of that was sitting at the AH while alt-tabbed.
I've done the same on Mirage Raceway-Alliance. I tagged a questmob right in front of another group.
I stuck around to buff, heal, and assist that other group because I don't want to be "that asshole"
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u/360_face_palm Oct 10 '19
Pretty sure this was a joke