Applying to work where I said "no" in the past?
There are many reasons why people choose to go to one program over the other. While there might be some thin-skinned people, I don't think that should lead you to rule out applying. Since applying to a job at a school is minimal cost to you, you should go ahead and do it.

Much more likely is that the only person who remembers is the person who would have been your POI.  I wouldn't bring it up unless someone asks.