Elon Musk is really hitting below the belt these days with his Twitter insults.

On Tuesday, December 14, Senator Elizabeth Warren called out the Tesla CEO on Twitter.

“Let’s change the rigged tax code so The Person of the Year will actually pay taxes and stop freeloading off everyone else,” she tweeted.

Musk was recently named TIME Magazine’s “Person of the Year.”

Musk, who has never shied away from a Twitter scuffle, responded to Warren with insult after insult.

He responded writing, “You remind me of when I was a kid and my friend’s angry Mom would just randomly yell at everyone for no reason.”

“Please don’t call the manager on me, Senator Karen,” he quipped.

Musk continued his war of words writing, “And if you opened your eyes for 2 seconds, you would realize I will pay more taxes than any American in history this year.”

Musk has also taken aim at Bernie Sanders and other Democrats calling to tax the rich.