“How do I help my uncle Jack off a horse?”

At my first developer job 25 years ago, any time we made a change in the code we had to add a comment at the end of each modified line with our initials and the date, because we had no version control.

Sure, maybe it’s a legit question, but it’s equally likely to be a troll who wants to have an argument about computer OSes. If the person who said “why mac?” is truly asking a good-faith question like you are positing, they could have put more than two words of effort into the question so that whoever responds doesn’t have to make a huge guess as to their intentions.