It's not his politics. It's his use of racial slurs and lack of any remorse he has shown since.
Yes, people can change and deserve a chance to do so. He got that chance and by all accounts, CHOSE not to change. Instead of showing contrition and empathy to those he offended, he has championed himself as some 1st amendment warrior fighting back against the "woke mob."
As others have pointed out, Bear has dealt with racial slurs hurled at him throughout his hockey career. Now, he is teammates with a guy who would be high fiving those douchebags while telling Ethan to "lighten up Francis!"