Oddly enough, one of my most unpleasant Dubrovnik experiences involved an Azamara guest and her bike - she literally steamrolled through crowds once she got off the tender. Literally drove it down the dock, careened off my ankle from behind and looked like a hot knife through butter as she plowed through tourists and locals ahead.
I always wondered how that aspect of Azamara excursions was doing - the hiatus may have been tied to my observation, pain:) or for other reasons.
One bad apple shouldn't spoil it for the bunch, 'tho. Hope that instructions, courtesy prevail.