What I heard - he was involved in Indian Princesses with his kids which is a father-daughter program the Y has sponsored for years. He sent a text with an offensive meme regarding Indians and somebody reported it.
The BP board voted him out and the Y banned him from their facilities.
In the world of Mort, this hardly seems like his worst offense over the years but clearly being a bombastic prick has caught up with him. It's sort of like when Al Capone was finally busted for tax evasion.
On the other hand, the Y running a program that is screaming what the left calls cultural appropriation, and in turn, freaking out on Mort when they heard this seems a bit of a stretch.
Perhaps the Indians that turned him in were from Peters Township.
I honestly feel bad for his kids if they can't participate with their father anymore.