I'm going to kick someone out of our group
Is there a reason that you want to kick them out?
Because he refuses to learn the rules
You are behaving in a way that is too rigid. Maybe the person is having a hard time learning all the rules. You should be more understanding and give the person a second chance to learn the rules.
Nah I kick him anyway if he doesn't learn the rules fast enough.
I think that you should try to give them a little more time to learn the rules, it seems like they are trying. It is not okay to kick someone out of a group activity.