Lots of other factors that would be lead into decisions and I wouldnt call it discrimination without other data.
Also, start to stop asking other students what their grades are. This shows a bit of immaturity in my opinion. I would rather have a student come in and say “I really want to be in the honors class and would like to know how I can improve so that I could be successful in that course” than one who just says “Well I was gossiping and I know that Bee got a lower grade than me so why is she in and Im not”. See the difference?