My boyfriend thinks I was being racist and I was not

So I am an 18 year old white girl. My boyfriend is a 17 year old black guy. His hair is long and it's not bad looking or anything but I'm used to black guys having low cut hair. And plus I don't want him getting judged since we live in the south. So as always I'm telling him I think he should cut it but this time it became an argument. It wasn't my intentions to anger him and he hasn't responded to me in 25 minutes. I'm fucking upset.