Unlike some have stated, it’s not necessarily racism. Escorts provide services for donations. It’s business. They have no interest in wasting time and every possible interest in maximizing their profit for time. They want to spend as little time as possible making as much money as possible, just like everyone else. It’s got little to nothing to do with hate for a given race, the size of their dicks or anything like that. And sure, in some cases maybe it does. Some people just are not attracted to blacks. Some aren’t attracted to whites. Or Asians, fat guys, men over 50 - whatever. That’s their prerogative.
According to a friend who used to work in the business - it’s just that a large number of customers ruin things for the minority of customers associated with their race. Largely, black men are a waste of time for escorts. They want to play games with her time, they’ll know the price in advance and try to squirrel out of paying it at all, or trying to force a half off deal. They’ll tend to be a lot more rough which takes further dates that night off the table, leaving the escort sore. They feel like they bought property, meaning they can be as rough as they like, as nasty as they like. Like paying for her time means they can smack the shit out of her, talk in a demeaning way, etc. They often try to make business deals (trying to work in as her pimp, driver, security, whatever). It’s a hassle, a waste of time more often than not and so they just dismiss it. That’s not to say that all black clients are like that, or that they think they all are. Their chances of coming across these types though are exceedingly high, and so they prefer to not waste their time. If in a given region white men for example are easier - paying without question, being gentle/considerate/staying within boundaries the escort sets, leaving (or letting them leave) at the agreed time, not getting attached or dominating, rough, etc. - they’re going to target those. Not to mention - frankly, again, the bad seeds spoil things. Their chances of running into someone associated with drugs or legal issues are higher. There’s just a number of reasons that have nothing to do with hate.
It’s like working as a car salesman. If you see a homeless looking guy walk up to look at a Mercedes, you’ll dismiss him to see another client who appears to have money and is put together. That doesn’t mean the disheveled man doesn’t have money and isn’t able to pay cash or that the put together business looking man can - it just means more often than not that’s the case, so that’s what you look for.
In some areas you’ll see other lines drawn. You’ll see them saying No Albanians. No Muslims. No Italians. You’ll even see women who won’t see white men, Asians, you name it. It all depends on the location, who wastes time more, and who is the safest option for both their health and physical safety, and the maximization of their time for profit.