In my opinion, advice, unless requested, should be kept to yourself. Also in my opinion, his reply was sexist, and would have worked just fine without the reference to how how he perceives women's driving skills.
On the subject of uke willingly bending their arm: they should keep a small bend, and at all costs avoid locking it out straight. That kind of action is stupid ukemi begging for a broken or dislocated elbow. If your arm was locked out during the exercise, that may be what the problem was, vs at which knee he chose to tsuki, and you are lucky you still have use of it.