Compare AJ's behavior to what you see on a regular basis in professional sports (football, basketball, hockey, soccer, MMA)...it's really pretty tame. Trash talking, a shove here and there, flashing middle fingers...compare that to NFL players who literally KILL people and continue to have lucrative careers.
Is AJ immature? Sure. Is he a jerk? Probably. But he's still an elite wrestler who can help Iowa beat Penn State this year. Plus, Penn State took on a guy like Andrew Long and hardly anyone batted their eyelashes.