In elections past, I have been a GOP poll watcher in Florida, and I usually got sent to deep blue precincts and counties dominated by blacks and old line white Democrats. My instructions were to keep a beady eye on everything but be friendly, so I chatted up and charmed the old gals who were usually in charge like we were all 18 year old at a chaperoned fraternity-sorority mixer. The bad ones showed themselves by acting sour, so I made it especially clear to them that I knew the minutiae of election law and administration. That kept things honest, more or less, and rarely did I have a confrontation or unpleasant word.
Sounds like the best approach.
In Detroit we have a thing called “White Intimidation”.
A Caucasian poll watcher or counter watcher intimidates just because they’re white and the poll worker is black.
Controlled disgust rules the day in that situation.