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In a string of messages that could carry serious repercussions from his team and potentially the NFL, the oft-troubled and mercurial star used his Twitter account (@ToonIcon) to call out the professional pedigree of head coach Todd Haley shortly after the Chiefs’ 37-7 home loss to the San Diego Chargers. That message was followed up with an exchange with another Twitter user, in which a homophobic slur was used.

In his first round of messages, which were posted shortly after the loss, Johnson references his father, Larry Johnson Sr., a onetime Washington Redskins player and the current defensive line coach for the Penn State Nittany Lions. He compares Haley’s lack of NFL playing experience (Haley was never an NFL player) with that of his father.

Johnson’s exact Twitter messages, in chronological order:

• “my father got more creditentials than most of these pro coaches. … google my father!”

• “My father played for the coach from “rememeber the titans”. Our coach played golf. My father played for redskins briefley. Our coach. Nuthn”

Following those messages, an exchange appeared between Johnson’s account and another Twitter user, in which the other user made a reference to an incident in which Johnson pled guilty to disturbing the peace after allegedly spitting into the face of a female patron at a nightclub. A message on Johnson’s account referred to the other Twitter user’s profile picture with a homophobic slur, calling it a “[expletive] pic” and called the user a “Christopher street boy.” Christopher Street is a well-known New York City street which became famous as a symbol for the city’s gay-pride movement.

The message posted in Johnson’s account containing the homophobic slur read:

• “think bout a clever diss then that wit ur [expletive] pic. Christopher street boy. Is what us east coast cats call u.”

The final message of the night on Johnson’s account read:

• “Make me regret it. Lmao. U don’t stop my checks. Lmao. So “tweet” away.”

Regarding the messages referencing Haley, Johnson’s agent, Peter Schaffer, told ESPN.com his client’s messages about his father were not meant as a slight.

“I talked to Larry about it and he was focusing more on pumping up his father than anything else, ” Schaffer told ESPN.com. “He wasn’t trying to downgrade anyone … yes, everyone is frustrated after a loss like this but I wouldn’t put too much into it.”

Clearly, it has been a frustrating season for Johnson. Through seven games, the former Pro Bowler is averaging a career-worst 2.7 yards per carry, rushing the ball 132 times for 358 yards and no touchdowns. He’s one of many players struggling mightily for the 1-6 Chiefs, who are in the midst of a massive overhaul under the direction of general manager Scott Pioli and Haley.