politeness - Are the 'Imperatives' used without 'please' or 'kindly' considered to be rude in the west?

Are imperatives considered rude if they are used without "please" and "kindly"?

For example:

Go ahead
OR
Please, go ahead.

and

Give me the eggs
OR
Please, give me the eggs

Answer

In my experience (in the Midwestern United States) I would recommend the following:

When you are using an imperative in a way that benefits the other person, it's not common to say please, and it's not rude. 'Go ahead', 'take one', 'let me know if you need help', are examples where you would not say please because you're really offering the other person something.

If you're using an imperative to ask someone to do something for you ('Give me the eggs', 'help me move this'), then it would probably sound rude to not say please. However, people will often phrase it as a question: 'Could you give me the eggs, please?' 'Can you help me move this, please?' If it's phrased as a question, please is not necessary, but it makes it sound more polite, especially with people you don't know very well.

An exception to the second case is that people who are friends will often use the imperative without saying please and without phrasing it as a question, because it's faster.