While it would be better reporting to let us know the reason for the appeal, I would say no, the appeal was not due to racism.
1. Sailing has many rules of racing and rules of the road. Appeals are common. As the Israelis reviewed the GPS tracks, it could have something to do with the course they sailed; a buoy missed? interference?
2. Every single thing that goes against Jews, myself included, is NOT due to racism. Many things? Yes. All things? No. To suggest so is, in my opinion, a form of racism itself. Could that be you?