Morata, who played with Cesc for Chelsea and Spain, was sent off as Como lost 2-1 to the struggling Viola.
A furious Cesc said afterwards: "Provocation is part of football.
"Those who can't live with it should play another sport. I expect much more from an experienced player like him.
"We shouldn't find excuses, and we shouldn't care what others do on the pitch."
Cesc went on: “I’m annoyed that I wasn’t able to help the boys understand the importance of the game.
"I showed them my experience as a footballer during the week, maybe too much, but it wasn’t enough. We’re a young team.
“It wasn’t a football match in the second half. Leaving that aside, the game has to be won with the right motivation and energy.
"I feel bad as a coach, because I wasn’t able to convey this to my players today. Maybe it was in our heads. We made a mistake in our attitude, we have to show more desire.
"I didn’t like the first half very much, the second half, I repeat, wasn’t a game of football."