Oh, you CAN ignore them!

[Redhouse]

Just remember, at least half(in most cases) of the gym will be on you for every call.

If you know the rules then you are ahead of everyone else in the gym.

I would be careful saying that you didn't see it. I think you realized this also after you thought about it. You may want to consider saying something like,"I didn't see a charge or there was no charge there."

Good job