Similarly - I cringe when people promote Bitcoin as 'no fees'. We need to be upfront about it. Especially to kids. They remember little dishonesties like that - and might hate bitcoin like I hate the banks for it!
If you can't even pay the fee with a unit of currency we're all use to, then I can't with a straight face say there are any fees. The typical transaction fees are currently less than a penny and un payable with our current financial system - so there really is no context. Yes, there is a fee, but the breath you exhale speaking of it is almost worth more than the fee itself. Now, having said that, I eventually get around to explaining the fee part when they are at the level of intelligently discussing the lower level blockchain discussions.