Self-proclaimed “Twitter King” and CNN host Don Lemon has a bone to pick with actor Jonah Hill.

After bumping into the Moneyball star in a hotel lobby on Thursday, Lemon claimed (on Twitter) that he left the brief altercation with an important lesson: “to always be kind.”

In a series of Twitter exchanges — most of which have since been deleted by both parties — Lemon and Hill went on to call each other everything from “tool” to “12-year-old girl.”

“I said hi what do you want me to do move in with you? I was in a hurry,” Hill wrote, later adding, “I walked out of the restroom and found you waiting for me. Shook hands, said hi and was on my way. Sorry if you found that rude.”

On Friday morning, Lemon, who has been with CNN since 2006, took to Twitter to announce his appearance on one of the network’s shows.

“Setting the record straight on the @jonahhill incident this morn on @startingpoint w/ @Soledad_OBrien,” he wrote.

Whether it was a shameless plug or a harmless attempt to really clear the air, Lemon and his Twitter nemesis are the newest members of the elite Twitter feud club.

From Chris Brown and Miranda Lambert’s post-Grammy exchange online to Anderson Cooper’s mix-up with M.I.A., Celebuzz is taking a look at some of the year’s most heated Twitter battles.

What do you think of the Twitter feud between Don Lemon and Jonah Hill? Share your thoughts below!