the restrained Rav Hershel Schachter
Basically, he was in the middle of giving a shiur by video and his wife interrupted to tell him that their daughter had a baby. He acknowledged and continued the shiur, when his wife expected a more effusive reaction. So he told the shiur about the baby and wished them all simchas, fairly dry, and continued with the shiur.
I am not sure what the criticism is precisely. ...