Well, Ron , I have a similar problem with my fellow aikidoka at the dojo. When I attack, either they moan, or they take it too personal and start fighting.
However, my teacher asks me to attack him as strong as I can, and to try to resist him as much as I can. I try very hard, but I never came close to affecting his technique even slightly.
My advice, test your teacher. If you can beat him, change the dojo.