[Devil's Advocate] A lot of people black people, for obvious reasons, have been on edge the last couple months.
You and the company may be clear on the duties of "relief", but the trainee never heard of it. You said yourself she wasn't being trained well. So to the trainee you're not her trainer or boss, just some pushy white girl ragging on her.
She's smart enough to know that as a trainee she better go along to get along for now. But she does comment to her sister/trainer she thinks you've singled her out to pick on. Trainer feels trainee has done an acceptable job, by her standards(maybe why she's still part-time), finds it expedient to explain your actions as racist.
That satisfies the trainee, and bolsters the trainer's earlier impression. That thought was on her mind and slipped off the tongue when you spoke to her. [/Devil's...]
Keep in mind I am not black, female, employed, or especially bright.
