This used to bother me as well. Now it doesn't bother me so much. If he's fighting full power then that can be a good opportunity. How will you ever have a fight at 100% if you never practise it? If your partner outweighs you a lot and/or is too strong for you then yes you have a right to complain and if he does not or cannot control his strength then simply don't spare with him, period.
If he's about your wight and or strength then you should take the opportunity to learn how to control yourself against a fierce, aggressive opponent. I have some training partners that go a lot harder than they're supposed to. I take this as an opportunity to avoid strikes with footwork and slips, rolls etc and also opportunity to work on getting on the inside.
If he's about your wight and or strength then you should take the opportunity to learn how to control yourself against a fierce, aggressive opponent. I have some training partners that go a lot harder than they're supposed to. I take this as an opportunity to avoid strikes with footwork and slips, rolls etc and also opportunity to work on getting on the inside.