I coach baseball. Is it racist that I didn't let a kid go to the bathroom because he's Jewish?

I coach sixth grade boys' baseball. (I also teach gym.) At practice last week, the Jewish boy on the team asked to be excused to go to the bathroom. I told him that the Palestinians in Gaza can't go to the bathroom when they want to, so he couldn't either. He ended up wetting his pants and I ended up getting suspended. I was just trying to teach the boys a lesson about fair play and standing up for the underdog. How can I make people understand?