"See John or me after class," not "See John or I after class."

He says it a lot.  He doesn't know.

He also says that he's been teaching for 25 years, which means that a quarter-century of students have heard the wrong grammar from someone whom they're unlikely to question.  

I'm not a grammar expert, but I know that it's wrong.

From YouTube:

Address:

https://youtu.be/k6U-i4gXkLM