As a simple matter of courtesy, I instruct my children to keep their opinions to themselves in those types of situations. Stick to the facts. After all, most adults, and particularly authority figures won't have the time or inclination to listen to speculation, especially coming from a child.
As a matter of self-preservation (ask any attorney), it is safer to say less and stick to facts; opinions and speculations can be misconstrued.
I have explained to my kids why shining the spotlight on their "savviness" can be annoying at a minimum and incriminating if misconstrued. Not every parent would be comfortable approaching it this way, but my kids are used to not having their feelings spared at home.
