I can answer the question directly, but there is literally nothing I can add that Shin and Sinister haven't already stated.
Would I still "talk shit" if one of my guys was "knocked the fuck out" by a kid who was coached by someone who never fought? A few things:
I haven't "talked shit" about coaches in general. The one exception was "coaches who aren't preparing fighters for competition". Those individuals indeed garner exactly zero respect from me as they're not striking coaches and it borders on insulting that they pretend to belong to that group.
The terms "talk shit" and "knocked the fuck out" almost immediately indicate to me that you don't compete in combat sport as literally no one talks like that. I would never say one of my guys knocked another guy "the fuck out", but I could tell you that they looked great in a fight where they won by 3rd round stoppage. I have an incredible amount of respect for those who compete in the sport as I PERSONALLY know the struggles and sacrifices needed to be made to make that ring walk. It's a very demanding sport, and when you lose, also a lonely one. I wouldn't disrespected a fighter in that way.
As Sinister had said previously, once the bell rings, all bets are off. Best camp, perfect preparations, everything leading up to the fight going 100% your way, never guarantees a victory. If it did, we wouldn't need to fight, there would never be upsets, and we'd declare a winner the day before a match. Anyone with two hands and breathing can beat anyone else on this Earth on any given day. The likelihood and probability can be skewed toward on fighter or another, but nothing is for certain.
At the end of every bout, our fighter walks over and gives respect to the opposing corner, their fighter does the same to us, we look across and give the "thumbs up" to the opposing corner, and we wait for a decision. Regardless who is across the ring from us, and regardless of my personal history with that gym or individual, the routine is always the same. So to answer your question directly, I never would have talked shit about them in the first place, so my opinion of them wouldn't change regardless of the decision.
Now, coming full circle, I'll address the original post as I have numerous times before, and as Shin has said perfectly in this thread countless times now.
Can someone be a good coach without having fought? My answer, as it's always been, is yes, but they're are exceedingly rare as an overwhelming majority of successful coaches have fought, and with good reason. There are things that you experience in preparation, competition, and post competition that are truly unreproducible if you haven't personally lived it.
I'll end with one more example to make my point of rules vs exceptions:
Evan Tanner.
One of my favorite fighters of all time, I had the pleasure of eating lunch with Evan and his girlfriend before his fight with Phil Baroni at UFC 45 (they sat a table away from me and my friends and we talked for a good 20 minutes).
Evan never really belonged to a fighter stable, often traveling from gym to gym to train. He literally taught himself how to grapple by watching Gracie instructional videos, and at one time had more wins by triangle choke than ANY other fighter to compete in MMA.
Struggling with incredible personal demons and bouts of depression coupled with alcohol abuse, Evan later went on to become the UFC Middleweight Champion.
If someone started a thread "Could someone train in their garage, learn how to grapple from instructional videos, never fully belong to a fight camp, struggle with severe alcoholism, and still become UFC champion?", I could easily poke into that thread and say:
"Two words: Evan Tanner"
Just because something HAS happened doesn't mean it is even remotely close to being considered a norm. Again, go to ANY local advancing tournament and put some eyes on local coaches. Most are going to have something in common, and that something is that they laced them up, tossed in a mouth piece, and they put it on the line in front of a paying audience who cheered for their blood.