I too think Archer and OP was at fault here.
Of course used language wasnt needed but they could choose different words to advice him.
+ really...who cares much about low level dungeon? Anyone can tank sastasha. When i was playing with friends nobody was tankin and it was just fun. ''Elites'' are to rough nowadays... never tough you can be shitstormed at low level dungeons for using bad skills... its the same as Healers being mad for people who use cure on low level dungeons...but its just so fun.