In Europe, the question would be considered unpardonably rude.

Inviting a person out and then expecting them to pay for their own drinks, etc. is considered extremely rude.

Shaming or humiliating people in public is considered extremely rude.

The host will not indicate when the visit has been long enough, since it is considered extremely rude.

In many countries, any form of boasting is considered very rude.

It might be considered rude or eccentric in the era of 24-hour supermarkets.

Smokers are considered very rude if they don't ask permission before they light up.

The term may be considered offensive or rude to some, because of its origin.

No one would try to interview her; here that was considered rude and disrespectful.

Not giving a tip may be considered rude and stingy.