I think there's a big difference between the interpretation of gentle parenting and the actual act of respectful parenting.
I hope I was the former. Most of the time, a very firm "stop that now" and a calm explanation as to why whatever it was they were doing at the time wasn't acceptable or appropriate, more often than not worked. Sometimes though, a raised voice and 'The Look' (as my grown up DC still refer to my angry face) plus the threat of an early bed was absolutely needed. My DC aren't perfect obviously, but they are kind, loving, content and successful adults with happy relationships and friends. I didn't parent in any particular style, but I think we did ok.
What I absolutely loathe witnessing is an out-of-control child wreaking havoc in someone else's environment, and the mother cooing at them "now then sweetie, we don't do that, do we/let's take a minute to think about our actions/let's remember what we learned about gentle hands/". When a 6 year old is tearing up somebody else's house/shop/property and throwing lego at their host or spitting food out on the floor, I personally want to hear "Stop that NOW", not "Oh bless you, I understand it's because you aren't yet old enough to articulate your frustrations verbally to us". I know the parents of these cherubs like to be regarded as 'gentle parents', when often the reality is they are just lazy bloody parents who are frightened their DC might not like them.
Gah, I've just realised I am an old fart, possibly stuck in a generation timewarp....