Thank everyone. :) The lesson went really well today, and I turns out that my gelding isn't too fond of jumping. The riding instructor set up a little tiny cross rail after pole work and he plowed right through it.
I couldn't stop laughing because he looked so proud of himself after killing the jump. Both of them don't want to ride my horse in lessons anymore because they said that he is "too much of a beginner's horse" for them. So, I can ignore them now that they won't be around my horse. I'm just going to stay out of the drama because I know that the BO would never put my gelding in harms way.