It might be useful in this discussion to talk about instances where we were victims of another's prejudices.
I have a number of them, but perhaps the one most germaine to this particular thread was when I tried to cross the border into Canada a few years back. My wife and I and our two terrier mix dogs were doing an extended RV trip towing our travel trailer. We waited in a queue of other vehicles, most of which were waved through after a cursory look at passports, etc. But, when we got to the booth, we were directed to a holding area for an interview and thorough inspection of our vehicles and luggage.
We were held there for two hours, while being scrutinized thoroughly. At one point, after searching and finding nothing suspicious, they asked again if we were carrying any weapons. I responded that I didn't even own any weapons. One agent actually said, incredulously, he found it hard to believe I was from Utah and didn't own weapons. What about for hunting? I don't hunt. Based on his bigoted assumption that everyone in gun-crazy American west had to own and carry guns, we were delayed for two hours.
Here's the kicker, when they finally released us and we drove away, only then did I realize I'd brought with me and presented at the border my old, expired and canceled with holes punched through passport, not my new valid one. They should not have let me cross at all because of that but didn't even notice it because they were so obsessed with proving I had a gun.