Yepp, But Tanks are always willing to listen I have learned. I have had Tanks whisper me telling them its there first time & I tell them its all good I will carry the heavy load & allow them to watch & get a hang of it and learn from that. An most of the time it is possible results. I have never witnessed a bad tank in LFR, maybe thats cause I prevent it from happening.
But Dps or Heals will snap at you if you try to help them in anyway or fashion.