First of all, look at whether the class cadre is the group owner or the administrator. Only in this way can he be qualified to kick you. Secondly, it depends on the contradiction between you and him. If you just delete friends, it should be nothing. Not everyone in college has a good relationship, and there will always be bad people. Moreover, the class group mainly publishes class affairs. It is a public group, not his own private group. He doesn't have to kick you out. And there should be a counselor or something in the group. He should also be embarrassed to do so.