Yes, anything with a skull or skeleton on it was a no no with my mom. It's probably fear of the occult, but often cross and bones is pirate...I guess that's not ok either, tho :) adoration of naughtiness I suppose...
Im actually not sure what the obsession with skeletons is, in tattoos and on bikers jackets etc. what is the message? I know it's not occult...but is it trying to convey a lack of fear maybe? This demands research. And why is a pirates flag a skull?