Why the Mac Is Not a PC
The Macintosh started out on the Motorola 680x0 family of processors, migrated to PowerPC architecture in 1994, and switched to x86 architecture in 2006. And during the Mac's 24 year history, the hardware has always been designed to run the Mac OS and no other.
...that doesn't make them PCs in the way the rest of the world uses the term....
Macs have been able to run Windows using x86 cards and software emulation, and more recent Macs can run Windows alongside the Mac OS with virtualization - and even boot directly into Windows using Apple's Boot Camp software. But that doesn't make them PCs in the way the rest of the world uses the term - and the way Apple uses it in its ads.
The Mac Is a Personal Computer
If anything, it would be nice if the Mac were seen as a personal computer - in contrast to an impersonal one.
Despite its name, the IBM PC was designed for the office, not the home. It was "personal" in that it had its own CPU and wasn't a terminal dependent on a minicomputer for processing power. It was designed for word processing, spreadsheets, and databases, and the standard business configuration included a green screen display and a text-only video card. You had to learn DOS to use the programs, and productivity software came with huge manuals. And if you wanted low resolution color graphics, you had to use a different video card and display.
Contrast that with the Macintosh, which came to market several years after the IBM PC and MS-DOS. It wasn't designed for a text-only world - when it handled text, it did so with finesse. On the Mac, you could actually see different fonts on the screen in different sizes and with different attributes (bold, italic, etc.). And you didn't need to learn cryptic key commands that varied from program to program, as in the world of WordPerfect, Lotus 1-2-3, and dBase II for DOS. You could use the mouse, easily select text, and pull down menus to see what your software could do. You are free to explore and experiment.