Ray J just pissed off millions of people -- one woman in particular -- after he compared her to a character from "Planet of the Apes."
Ray J Instagrammed the above photo Friday, writing the caption, "I usually don't go this hard but ... This chick look exactly like a character on Planet of the Apes."
He has since deleted the post -- but the fan he targeted (a woman named Tina Chastang) tells TMZ, she was mortified when he singled her out on his page.
In fairness, Tina admits she egged Ray J on a little, posting inflammatory comments on his Instagram like, "Ray J you are irrelavant. Why dont you stop worry about Kim Kardashian. Why dont you talk about you being gay." But she insists he didn't fight fair.
Sources close to Ray J tell us, "This girl is an Instagram bully. She's been making negative comments on everything Ray J posts for months. He's been trying to take the high road, but finally decided he needed to give her a taste of her own medicine."