Brown appeared to reference Smith-Schuster's 2019 stat line in the attack:  

AB @AB84

Boo Boo Shoester was ready under 500 U Bum learn some Respect

It's the latest twist in an on-and-off feud between Brown and Smith-Schuster, who previously formed one of the league's most dangerous receiving tandems.

AB @AB84

Emotion: boy fumbled the whole post season in the biggest game of year ! Everyone went blind to busy making guys famous not enough reality these days ! 🤙🏾 by the way check the list

The situation seemingly stemmed from Brown becoming unhappy in April with a graphic that showed his counterpart as the Steelers' most valuable player last season. The Steelers wideout responded at the time by saying, "Crazy how big that ego got to be to take shots at people who show you love! Smh," per TMZ Sports.

Brown was traded to the Oakland Raiders in March and, after his relationship with the franchise's key figures quickly disintegrated, he was released and signed by the New England Patriots in September. The Pats waived him amid allegations of sexual misconduct. He's remained a free agent while the NFL investigates.

It's been a whirlwind year for Brown, but apparently, he hasn't forgotten about his beef with JuJu.