The 26-second clip -- posted by Brentwood Students Against Racism -- shows several young white teens singing along to A$AP Ferg's, "Dump Dump" ... which features the lyric, "I f***** your bitch, n****."
The video got to Barry, whose daughter, Aisha, attends Brentwood School ($37,000 a year) -- and he tweeted, "I am sad that i had to see this at my daughters school. #Racism #Fixit #Suspension."
He's not the only one calling for action ... a Change.org petition was launched and already has more than 400 signatures.