This is one of those topics that can quickly degenerate, since it gets
into intelligence/planning and all the other anthropomorphic qualities
people tend to ascribe to bees/dogs/cats/your choice.

The more probable differences in behavior have been discussed often on
this list and they are odor, skunk visits, clothing, improper handling,
the aggressive hive etc.. Since it is difficult to know what someone
splashes on themselves, the nature if the fabric they are wearing, and
if skunks visited in the night, it would be a bit presumptive to ascribe
aggressiveness toward one person by a colony to the bees using visual
messages to identify the person.

Try wearing a wool sweater out to visit your colonies and see if they
decide that it is only you making a fashion statement and leave you
alone.

Bill Truesdell
Bath, Me