First, read this: Why it's better to pretend you don't know anything about computers.
When random people - such as my cleaning lady's husband - ask for help with computer problems, they are almost always using Windows. So I can say, quite honestly these days, "Oh, I don't know much about Microsoft Windows, I only have a Mac and it is really different". And I am saved from a world of continuing pain.
When non-computerish friends and relatives do ask me for help in choosing a computer, I always recommend getting a MacBook. Because I just know there will be far fewer requests for free technical support afterwards.