Honestly, the only angry people I see in low level dungeons are the newbies themselves.

Conversations in these cases tend to go like this:

Vet: Hey, be careful about not standing in x AoE.
Newbie: DONNNNNNNNNNNNNNNNNNNNNN'TTTTTTTT YOU FREAKING DDDDDDDDDDDDDDDDDDDDDARRRRRRRREEEEEE TELLL ME WHAT TO DO!!!!!!!!!!!!!!!!!!!!!!!!!! *FLIPS TABLE* *EYEBALLS BULDGE OUT OF HEAD FROM RAGE*