Eh, Nate's never really been shown to ragdoll people around with hits, even though he should clearly be able to, based on his actual strength feats, KO'ing a Dominator with one flying punch, as well as the time he broke the Wave Rider during a sparring match with Ray. So, this suggests to me that he just massively holds back so as not to seriously hurt anyone. And he doesn't really have any formal combat training, so he probably doesn't know just how hard he should be hitting.
As for getting knocked around, that happened a few times last season as well (like the time he got tackled off a cliff by some random fodder despite going into Steel mode). And the hits from the mooks in this latest episode seemed more to annoy him than anything else. He was still upset that Wally got involved and ended things early.