It seems that British people often use "Off" to mean "not polite or friendly" or "not acceptable".
-off (with somebody) (informal, especially British English) not polite or friendly
He was a bit off with me this morning.
-(informal, especially British English) not acceptable
It's a bit off expecting us to work on Sunday.
But "not acceptable" is ambiguous because any bad thing can be unacceptable. Weird or eccentric behaviors or crazy actions can be unacceptable. For example,
She's a bit off today. She's wearing warm clothes on a hot day
My wife's a bit off today. She's been shouting at me all morning
This man is very off. He is running around naked in his garden
Also, Do American people say like that?
Do we use "off" for virtually all bad actions (such as weird or eccentric behaviors) in American and British English?