Posting on Instagram alongside images of hateful messages sent to Morata, Alice Campello wrote: "Do we realise we're talking about a football match?"
In another post, she added: "In life, we all make mistakes. Life is made up of lessons, experiences, good and bad moments for everyone, but we are no one to judge others.
"Football is like that, and I think that's the beauty of it...being so exciting and unpredictable...it's sport and it's entertainment, so we have to give it the importance it deserves.
"I would love to see the lives of each of the people being criticised for a mistake and see how perfectly they do everything and what they've achieved in life...please, have respect and stop being such mean people."