Some of the casters in H SV will Moonfire or Frost Shock random targets even if you have aggro. He could have thought you were having issues holding threat when it’s just the mechanic.

If you had a melee dps getting hit a lot he might have you were tanking them facing the wrong direction, but that’s incorrect. It’s not Cleave. It’s Sweeping Stikes. They will turn 180 to hit you, you have to leave melee range entirely to avoid it as a melee dps.

It might have also been your kill order. Sirens must die ASAP due to their 10 second AOE silence.

It could have been you asking for sheeps, or the opposite. I’ve had tanks refuse to mark/ask for CC, and I’ve had DPS refuse to use CC. Both of types of people are fucking morons.

Maybe you didn’t use the skips he wanted you too, or maybe you used skips but he wanted rep.

There’s a million reasons, but like 999,997 of those reasons are all on him so I wouldn’t worry about it.