I had to get my brother to help with my foster daughters hair

So I had to suck up my pride and ask my 17 year old brother for help with my 1 year old black foster daughters hair. I really offended him when I said I didn't want to take his advice because he's a teen parent. He has a 2 year old biracial daughter. Mom's not in the picture. He went off on me several days ago because I thought people were staring at me because I'm white with a black foster daughter and he said no it was because my hair looks good while I have hers looking bad and that he may be a young dad but at least he put in the time to learn how to do his daughters hair. Many of you told me to apologize so I went over mom's house yesterday and asked for his help. He said "I thought you were too good for my help. What was that thing you said? I don't want to take advice from a teenager playing house." I apologized to him but one thing about my brother is he hold grudges. He basically said "Fuck you Lia, but it's borderline child abuse to let someone have their hair like that so I'll fix it. For her not you." When he started he started scolding asking wtf I was doing to her hair and whatever I'm doing just stop because I'm ruining it. We were there... I kid you not... Nearly two hours with him doing her hair. He told me it sometimes takes him 3 hours to do his daughters hair. I said "3 hours?! Idk if I have that type of time!" I didn't mean it like I wasn't gonna do it. I was just saying. He goes "I go to High school full time, work and take care of my kid and her hair NEVER looks bad. Find time." He also gave me some tips and said to stop washing her hair every day. I asked if I could borrow some of his hair supplies but he said "Uh fuck you, this shit is expensive." He just told me the names so I could by them myself. He definitely is still pretty pissed at me, but he made her hair look really pretty and gave me some good tips. I was already moved out the house when he had gotten that girl pregnant so when the baby came with them I guess I just assumed mom took care of her. I didn't realize my brother did a lot more for her than I thought. When I asked how he learned to do her hair he said he would stay up really late and watch YouTube videos and practice on dolls. I guess now I understand why what I said hurt his feelings. But I'm glad he helped!