[cortesoft]

My understanding is crows can recognize individuals, so I would think back to what you did to piss off that crow, or that crow's friends.

[bitwize]

As demonstrated in humans, the ability to recognize individuals is little impediment to resentment based on group membership.

[JohnMakin]

I was guessing just a general preference towards anyone in their area. I have certainly never done anything harmful towards them.

[shimman]

Crows have been known to harass distinct individuals over others, even going as far as to teach other crows about this person.

I wonder if this was an elder crow whose eyesight has decreased with age and gave out the wrong descriptions to their friends. :D