This is not a great look for Pixar Charlie. Some may say he was a true Accessory to the accosting/assaulting that was taking place here. Gee, he could also face consequences from Disney with now being at the scene of two very controversial episodes at the Theme Parks (Columbia Situation).
However, I believe he can completely have a redemption arc right now though.
He just needs to make a little IG story that condones Spencer and Katie's behavior to Justin. A quick 45 second video that just states:
"No One should have to deal with what Justin Scarred had to face on Main Street on Princess Night. SHAME ON KATIE AND SPENCER!"