As a tank myself, yes I am entitled...I mean the game rewards us because we lack in numbers, therefore I'm entitled to do how I see fitting because hey if you don't mind waiting a trillion hours for a tank, you have to deal with me for the next 20 minutes.

Jokes aside though, about the mass pulling, the game is so easy when it comes to dungeons that not mass pulling is kind of redundant: dungeons offer zero challenges and they're just there for giving you the daily grub of tomes and forget about it for the next 24 hours so of course I try to do fast: the faster I'm done, the sooner I can go do other things and play other games.

Now if a tank doesn't want to mass pull, I'm fine with that: I often do that too because I'm either not in the mood or sometimes I need to practice. I know right? tanks practicing a bit the new dungeon? Blasphemy!
I don't think complaining would make things work better and instead, there should be a mutual agreement or at least a discussion: sometimes as a healer, I get asked if they want to mass pull but I always reply with "sure I'll try", and nothing happens. Discussing things works wonders in these cases and as a tank I ALWAYS try to make things work because, let's be frank here, we're here for only 20 minutes and then go on our ways so I fail to see the point on fighting among each other because now the dungeon will be completed in 21 minutes instead.

However considering I got kicked for lesser things such as "not getting aggro within 0,00001 seconds", showing "how great" this community can be, I don't feel bad if I'm entitled or become harsh: in my world hate begets hate and if people don't want to settle down and have a discussion with me and just have me kicked because I decided to not pull a single mob or because I'm not worthy of their attention, well, then I just have to kick back and show that until the game fixes the tank's lacking population, you are going to deal with MY ways and that's final.

I didn't ask for these 20 minutes to turn into a full-blown war but they asked for it ¯\_(ツ)_/¯