Too many players on the court

[Coach Bill]

Middle School AAU game played under NFHS rules.

After a timeout, the other team sent 6 players on the court. We brought the ball up from the backcourt to the frontcourt, when I noticed they had 6. I yelled to the ref, they have 6 on the court. The other coach heard me yelling, and yelled "So and so, get off the court!". His played stepped off the court right in front of the ref, and hustled back to the bench. I ended up getting a technical, for complaining that they didn't call a technical on them. They admitted they saw it, but ignored it.

I'm not complaining about my 'T' (I deserved it). But, are refs reluctant to call this 'T', because perhaps it's their fault for not counting and signaling?