A bias where people unconsciously say, and feel, things others would probably deem to be socially acceptable, rather than the truth they would feel in a different situation, especially when different people, or nobody, were present.
From the TEDTalk Daily podcast linked below…
The definition I gave above is actually a truer, and fuller, definition than those found in other places like this Alleydog site. That’s because, if you listen to the TEDTalk Daily podcast linked, we don’t always know we’re doing this! That’s why it’s a “bias” and not some completely deliberate action. Biases, rather than conscious choice, are a lot harder to fix. Sort of like how you can’t solve something if you weren’t either aware of it, or be willing to admit it. The typical given definitions suggests we are aware and making a conscious choice to show courtesy bias, but sadly, it ain’t so!