Uhh...did you say "Hey man I need something to grind my weed with!"

If so, then yea...they should've kicked you the hell out of there.

I mean...the headshops here have bongs, pipes, papers, blunt wraps, grinders, and everything else on display...I half expected to find a vaporizer (asked for one, guys said they don't carry them). I mean..a grinder is a grinder...legally it may be marketed as a "tobacco grinder" or something, but asking for just a "grinder" shouldn't cause a problem. You had to have said something else...