Why I'm "racist"? Apparently??

So for the longest time where I've worked there is a lot of different races. Which is good. However some of the black students are the worst thing about the staffs day. A large number like to sit in a large group and talk shit about everyone DIRECTLY AT THEM. Not just anyone quietly at the table, no, but look up at other college students and staff and bullshit them about anything. These are grown adults supposedly. I'm in the break room fuming after being told I am shit at my job for no reason. Wasn't even talking to them and was helping another student 15 feet away. Just horrible crap about how my assignments are too hard and I'm a bitch. I ignored them of course and continued what I was doing as always. I don't give brats attention. I'm not the only member who hates working with them obviously, but I'm the "racist" one because I don't know which one does it. Why? Because I, again, ignore them. I don't look at them and see who says what when they're being assheads. Though I'm 200% positive that they all say things sometimes because I do occasionally glance at them, I'm the racist because I can't always tell them appart. They all dress similarly, they all sound similar, they all talk the same smack. Nevermind that I can't tell the clone kids of literally any other race here appart either. Unless I personally know them or they're under my ward I don't usually just try to memorize anyones face. I'm terrible with names too. I've always been this way! It's not uncommon to suck at recognizing people you barely know.

But nope. I'm a racist according to a few staff members because I can't tell this one troop of boys apart. Not because I can't tell a lot of the other poc kids or white kids apart, just these 7 black guys. This is rediculious but if not knowing every black persons name that goes here makes me racist, then I guess I'm freaking racist.