I never heard this guy telling jokes but I've seen people commenting about it on Twitter for a good long time. He's liked.
Is it professional? I don't know.
I've always thought the best transit operators are the ones you don't ever think about. They show up on time , always courteous and get you to the destination on time. No flash no splash. They just do their jobs with with professional consistency.
You'd be surprised how many true professionals there are at Trimet.
It seems like people enjoy this operators jokes, why is it necessary to shut him down?
It's not unsafe.