No. Why should it be? what difference does it make if they are Chinese or not.
It's impolite to ask a woman's age. :) ...which can be determine by her birthdate.
You may ask twice before it is considered rude.
It's mildly impolite of them not to have asked you. It's seriously impolite of you to make a big stink about it, as long as you're not picking up the tab. (If you are, then for them not to ask you goes from "mildly impolite" to "downright rude", and your response is justifiable.)
I guess ask them. Although, I warn you that in most circumstances that would be a very impolite thing to ask, and you might get slapped.
I am assuming you may think it is an impolite question, such as asking a woman her age. There would be no breach in manners to ask a woman what is her religion.
It is not illegal to ask someone who they voted for in the United States. However, it is considered impolite and a violation of privacy to pressure someone to disclose their vote.
If you have to ask, you can't afford it.
One can directly contact ASK Italian Restaurant via phoning or emailing the restaurant. The full contact details should be found on the official website. An alternative, would be to locate their address on their official website and visit the restaurant.
You can purchase restaurant equipment such as a restaurant grade freezer for your personal use from sites such as ebay. Your best bet is to ask local restaurants.
I would say to you "It's none of your business" It is very impolite to ask anyone what they earn. Get some manners.
If you ask what is the most popular dish served in the restaurant you are seeking the mode.