You'll get different answers for this question because everyone has their own tolerance level. Some people will cut you off at the first slight, others will give you a chance before they get rid of you, so the answer depends on the person. As I get older, it doesn't take many red flags for me to cut someone off. Some offenses are so grave that they warrant immediate termination. Even if you give someone a pass, have they learned or are they trying to play you again? Only that person can decide.