I think with any dog sport you need "thick skin" as mentioned before.

A similar incident happened with Pixie at agility practice; one of the other handlers was walking her spaniel when Pixie and I were out on the course, and the cocker started to bark at her. Pixie then started to run toward her (we're still working on training with distractions) and even though she responded to my recall, at the next trial the spaniel's owner announced that Pixie had "come after" her dog at practice and to "stay away."

So ehh...we changed out of that class and are now ina different one. I'm not letting it get to me too much, but I know it can be hard. I'm alot like you, in that I'm very sensitive, anxious, and get hurt easily.