Apple cider vinegar made sunburn worse?

My son got a bit of sunburn on his arms today at football practice. I was looking up some quick home remedies and apple cider vinegar kept coming up so I tried it. I diluted it with a little water and had barely started patting it on his arm when he started freaking out and said it was lighting his skin on fire. ... show more My son got a bit of sunburn on his arms today at football practice. I was looking up some quick home remedies and apple cider vinegar kept coming up so I tried it. I diluted it with a little water and had barely started patting it on his arm when he started freaking out and said it was lighting his skin on fire. Is that normal for it to sting like that? What did I do wrong?
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