I'm not being flippant.
Whatever actions you take as a coach is setting your team culture (especially as a junior coach).
Your action in (I presume) questioning a ref over something which is either a minor human error (or God forbid perhaps the ref didn't see it) - to me sends the victim mentality message.
I never react to step on the line, last touched, 3 second calls that I think perhaps I was on the wrong side of. My boys normally do react and I will always say shut up and play ....step in court and back - really I couldn't care less, my mind is on things I can control - e.g. what D are we running are my guards placed, have my big guys motored back with an eye on the play etc.
The only umpiring decision I may put my hands on my head are when one of my lads does not get a charge call and done for a block....and at least in this situation my player has done something to earn a call. Even then my reaction is to clap my player and let him know I'm happy. At the end of the day I'd say 90% of my players are looking for my blessing on how they execute the game plan.
If I'm beeyatching a in bound violation ....well I'm personally not happy with the look or message that sends.
On Saturday - on a timeout the ref gave the ball to the opposition without even giving us a word of warning. My reaction (after the game) - I praised the player who spotted it, called it and got us on court before they scored. Secondly I just said to the refs - guys normally a whistle and a warning is common courtesy and shock horror ...the refs said ''Sorry coach we did, next time I'll run a bit closer'.
Not sure what you want a ref to say ....when I used to ref any player bitching at a call, I would say 'are you shooting 100%?'
Finally - it's 12's basketball, my experiences is how I coach for 16's & 18's in rep ball ...the refs will be learning too.
Trust me - as a coach control what you can control, be focused on your team and expect your team to be focused on your team - you'll get far, far more W's for the effort.