Why did Auggie's dad not want him to wear masks ?

Auggie's father tells him....

"I couldn't stand seeing that thing cover your face anymore."

"I love this face of yours, Auggie, completely and passionately. And it kind of broke my heart that you were always covering it up."

Auggie's father loved him..... everything about him. He wanted Auggie to be proud of himself.... as proud as he was. He also wanted him to accept himself and stop hiding.