Is saying "can you do this for me" rude? [closed]

I recently got into a conversation with a freind who said it's rude to directly ask people without using the word "please" or converting the question to an indirect one. In the US this is the norm and I seem to have seen countless people using it on a day to day basis.

Can I get a fry?

Can I have a cup of tea?

Leaving the word please out of a question is not rude. Leaving it out of a command or statement is.

It is rude to begin a conversation with a stranger or ask a question without saying excuse me. Direct questioning is fine once we've said hello.

There are levels of curtness the working world expects; I'm going to look at you funny for a second before I answer your question of "Excuse me, hello. I was wondering if you could tell me what time it is, please?" I wouldn't if you just asked "Hey, what time is it?"