How Do You Handle Hatred From Another Parent ?

Any activity that gives you stress is simple not worth perusing; you tried for a year and its not working, I say just quit.
But if I were you, I would get the man and her together (maybe after class) and address the issue. Something in the lines of, "I am not sure if I offended you. If I did, it was without my knowledge. But We decided not to continue at the camp anymore because of you and the way you have been treating me. This is not the kind of environment that my kid needs to be exposed to. We loved it so much but its come to a point where I have to make this hard decision and call it quits."

 

In my view, it is not worth the stress. How much importance, do you like to give for that activity in the future? These days, kids try every kind of sports and eventually pick one - that would be tennis.

In long run, team sports is not for our kids because many parents here, re-live their life through their kid's sports. As you described, it could be the extreme in some cases. I experienced somewhat like that in local baseball league. Let it go, find another activity for your kid rather than exposing him/her to the toxic environment and bitter feelings at this age.

 

Persevere. It will always work out in the end.