How Do You Know When a Joke Has Goed Too Far?

Comedian talks about raceing our comedy. How do you know when a joke has gone too far? When people are emailing you after the show and are upset, that means it hasn't worked. What is your thoughts on pissing off white liberals who don't want to confront sertenthing? I think i did my job. It's really important that people laugh because they got the point.