Some people will push others to achieve greatness. But only the great will reach for it when given.
Don't take it as a DPS being toxic. Take the suggestion as a way to improve. It's not a bad thing when it happens, nor is it (usually) anyone trying to be mean on any personal level.
We're mostly talking about the trash mobs in a dungeon, not bosses. Bosses should be pulled just how you described.
