If we are basically decent people we are likely to recognise, reflect on and interrogate our prejudices to see if they are justified or not. That's how we learn and become better people. But nothing can be forced.
Who hasn't mimicked others, made bad jokes or 'iffy' remarks - at least in private? Does that make one a bigot, beyond the pale in today's identity politics obsessed culture?
I've no idea about whether Waters made the alleged remarks or not.
Does making remarks that someone construes as antisemitic make one antisemitic?
How many problematic fleeting remarks does one have to make to justify one acquiring a label, a fixed identity (an antisemite, eg, rather than someone who makes antisemitic remarks now and then)?
What right does anyone have to speculate on the core of someone elses being?