Some times being "nice" isn't, and some times being a "jerk" isn't.
Very true Lynn.
I've heard our top man say many times that an uke that just falls over no matter how badly you do a technique "is not your friend".
It comes down to uke either refusing to accept bad technique and offering constructive feedback either verbally or simply by physically not accepting the throw.
This is usually positive as long as it does not become blocking simply to prove that you are better than tori.
If anyone deploys this tactic then remember a bit of explanation should help even the newest of the new appreciate that you are trying to help and not just being awkward.