family member disciplining my child while I'm present

I'm so upset by what transpired while at a relatives home that I can't sleep. While at a relatives home for dinner, my 7 year-old son was playing with a cousin. Now, my son is an only child and can be, in my opinion, a bit unruly at times. However, I do believe that my husband and I handle any instances of unruliness when they happen. The first incident that occurred tonight, I did not witness. My son came to me to tell me that this family member (let's call him P) kicked him rather hard when he was in the kitchen. P is an adult. I figured my son was just being a little sensitive. I advised my son to stay out of the kitchen and away from P. The second instance I heard P slap my son on the forehead (I'm not sure what about), not hard, but I found it inappropriate. My son seemed more hurt feelings over the incident than anything and I decided to let it go. My son and his cousin were asked to keep the noise down since another family member was going to bed. I didn't think the kids were being overly loud but my son made a little too much noise and P was near him and flicked him hard on his forehead. Everyone seemed a bit shocked. P's wife laughed, which really pissed me off, my son began to cry, and that was it for me. I picked up my son and walked out the door. My son has told me numerous times that P is mean to him, not physically hit him until this time, but calls him names and the way he speaks to him. I told my son that he is no longer allowed to go over to P's home or be around him. My husband somehow didn't notice any of these incidents and stayed after I left. Am I overreacting? via /r/Parenting https://ift.tt/2lrqDm2