Possibly because the cost for entry to macOS is higher than with iOS. Most people are able to run a Windows computer at very little cost, and will never have any interaction with a Mac. Meanwhile, iPhones and Android phones are (broadly) on a par in terms of cost.
I will say though, speaking as someone who's used Macs since 2007, as much as I'm no fan of how Windows works, I won't give anyone shit for doing so. But I used to get quite a bit of vitriol for my choice of computer.
Meanwhile, iPhones and Android phones are (broadly) on a par in terms of cost. This is only true if talking about mid-high end phones (and probably only high-end), you can get really cheap Android phones, incredibly cheaper than Iphones.
