I sometimes get one that answers "As far as I know."
My reply: "Coach, that's a 'yes or yes' question."
We each get to decide how we are going to handle a "smart BUTT", so responding to stupid answers from a Head Coach is a decidedly personal option. However, as some may recall, prior to the rule revision REQUIRING a Head Coach to CERTIFY that all (as in each and every one) of his players is legally equipped, it was the responsibility of the game officials to verify players were properly equipped.
When the Head Coach CERTIFIES that his players are properly equipped, he lifts a huge liability off the shoulders of the officiating crew and places it on his back, should any student athlete participate without the required, or legal, equipment and subsequently suffer (or cause) injury because of it.
Of course, if any Referee chooses to accept that unnecessary liability, so as to save the 10-15 seconds to ask and have answered the suggested CERTIFICATION, that seems within his power to do so. You might consider that not all required equipment, nor illegal equipment is readily visible, although the Head Coaches certification covers all that is seen and anything that is unseen.
Believe it, or not, sometimes the Rule Makers actually have the official's interests at heart. Whether we choose to accept the benefit of their concern is our choice.