I had a similar situation, both with the parents and with the child. I ended up terming care due to his aggressive behaviours but it wouldn't have lasted much longer as the parents did not respect my rules regarding payment and not bringing kids sick.

Now I just had a situation with different parents who were trying to drop off whenever they wanted, were argumentative and rude when I tried to talk to them about it. There were other issues but this was one that I couldn't and wouldn't let slide. So I emailed them both (I had already tried verbally talking but like I said they were really rude), and told them how it was going to be, that I could empathize with their situation but that the group's needs required these changes. At that point, I didn't care whether they stayed or went because I had had it with them. They wrote back and apologized, verbally apologized again the next day, and are now 100% different. I think they respect me more because I stood behind my rules.

As far as liking the kids or not, I think that because they are kids in our care we feel badly when we don't connect with them. I like to put a smile on my face before I answer the door, greet them with a positive comment (good morning, sally, you have such a great smile in the morning) and continue to look for the positive. Fake it till you make it. If he is disrupting your group as much as you say, I would term. Once I termed my aggressive child, the group dynamics changed immediately. Like 5 minutes after he left. The kids are happy and I am smiling. I will never let one child disrupt us like that again.

But yes, stand behind your rules. If you don't have rules in place for these situations, fix them and enforce them. It may be difficult to do this but it will get easier and the parents will respect you for this. The ones who don't like it will leave. And those are the ones you don't want as clients, anyways.

Good luck!