How would you handle finding your boyfriends secret Twitter account...

I found my boyfriends secret Twitter account on his phone and he's saying everything he posted was a joke. My boyfriend is a white man btw. Some of his posts were "Sometimes when I'm walking through a black neighborhood, I wish we could bring back lynching N words".

"Who wants to go on a f@g killing spree! Let's start at (local high school). They're having their gay straight alliance."

"Too many Jews around. #WeNeedHitler"

These aren't even it. There were so many bad ones and these were from like 5 months ago and he's saying they were old jokes. I don't understand the punch line .... This is white supremacy type stuff