My sister's boyfriend guys and lady's what to do.

If you do not think that this rough boy can be dangerous for your sister; so he is only and simple mannerless/disrespectful, then do not deal with the question. Your sister just started to go out with boys, she has to learn the good and bad sides of boys. Like little dogs has to learn running, jumping, swimming etc. Give time for her to go through these lessons. Okay, keep one of your eyes on their relationship.

I think its kind of immature to make him work harder because of that - you should at least be an adult about it and talk to him about the situation. If shes happy with him then step off, don’t ruin it.

I know you’re worried about her, but treating him bad will just push her away. Until she figures out that he’s not right for her, there’s not much you can do. The more you push, the more she will go to him, and the less likely she is to come to you when she does have a serious issue with him. I know it is tempting to beat him up, but that probably wont help too much, I suggest you back off for a bit. Let her know you will be there for her…