I had a tori who did that to me once. Normally I do not have a problem with it, though it can be hard on the ribcage. But he was being sloppy and desinterested. Untill I managed to hold om to him as he was holding on to me and pulled him with me into the fall.
That opened his eyes a bit.
A lot op people think the goals of aikido techniques is to throw somebody to the ground. That is not the goal, it is the consequence of good aikido technique. On the other hand, the consequence of wanting to throw people to the ground is often bad technique.
Glad to have helped. Once again good luck and have fun.