Common? Sense? Courtesy? One word for it. Please.?

Answer 1

Respect.

Answer 2

The opposite of what you describe is "uncouth": behavior.

But "couth" is never used as a positive adjective alone in English.

So what you're seeking is a term for the reality in which someone treats another person with courtesy, in a common sense fashion, in order to expect the same treatment in return from a categorically equal other person.

It's mannerly behavior.
It's courteous behavior.
It's an adverb of how treating someone else is being done
perfectly-well-enough.

I know of no term in the language other than those two that exactly covers the requirement of categorical equality without condescension for the sake of harmonious interrelations.

Answer 3

Respect

Answer 4

decency

Answer 5

sensiblity