IMO, this ("keep your hand on the S/B") is a perfect example how to "operate" a crew - NOT.
If I treat my F/O like a child, IŽll have a child in the R/H seat.
CRM is not about staying with the book all the time, its how I get my Cockpit (and Cabin) to stay as close as possible to the book, using the highest possible level of teamwork - as we are all human and will deviate from the book because of emotion, health etc., no one can stay with the book 100% of the time.
If one deviates like in the e.g. I most probably would not have said anything at all, maybe after landing.
A gentle, calm, fair debriefing helps much more than building stress inflight with this kind of response the Capt used.
just my 2 cent....