News producer turned comedy writer Jenny Johnson makes fun of Chris Brown on Twitter a lot ... and earned a vulgar, sexist response from the singer.
Johnson has had a field day with Brown for years, but it wasn't until she tweeted a response to one of his musings Sunday that she got his attention.
Chris wrote, "I look old as fuck! I'm only 23..." Johnson re-tweeted that with the comment: "I know! Being a worthless piece of sh!t can really age a person."
Brown responded in typical fashion ... hurling sexual, graphic insults at Johnson. See below: