It actually is harassment if a tank told/asked you to stop and you continued doing it. And 2 other people obviously felt the same way, regardless if they voiced their opinions about it or not. And I guess if Tam-Tara trash is so easy then tanks should just stop caring if the healer steals hate?
I love when healers DPS, as long as they can keep up heals while doing so. It speeds up the run. But knocking mobs back for no reason is just rude. Especially if everyone is level synced in a dungeon other than the tank. It's extremely hard to keep hate from level synced toons, even in full HQ level-appropriate gear.