I was was hired and my manager didn't provide me with a uniform shirt, but another new hire did. Is this discrimination?

I am a black male who was hired at a restaurant, I didn't receive the uniform thinking it was after my training. But when a white new hire was brought in they gave her the uniform on the first day, I asked my manager why is this and she said because her assumption was that I was going to quit the next day. Is this discrimination?