I became friends with a mom in my neighborhood. Our boys are both 4 and played pretty nice the first few times. However, recently, her son has become very mean to my son. He will pick on him, grab toys out of his hand and insult his drawings, etc. I have never encountered such a mean 4 year old. He is actually like a little bully, sometimes, even rude to me. His mom corrects him, but doesn't make a big deal about it and will sometimes ignore it. My son usally lets it roll off his shoulders, but It's really starting to bother me. The other thing is that I have had them over my house numerous times and we have never been invited to their house. Am I being too sensitive or would this bother you too?