I try to avoid non-football words or additional talk in youth matches. Dissent is very rare, so low tolerance fits.
Just the facts. I don’t think spending time sweet talking is anyone’s interest. The exception is with a very young player that is hurt/upset - even then, if I say a few kind words, it is part of the segue to the responsible adult.
I find the players at 15-19 mercifully straightforward (and predictable) - it’s the coaches that are hard to handle!
17/18 year olds in England are far from straightforward!