Are you serious? Mac's are PCs.
PC always meant personal computer. Computer means processor. So PC in essence was a bus word to say personal processor. In essence PC can mean any console, to any phone, etc. If it has a processor, it's a PC. However lets just forget the logistics. This started back when Apple tried to distinguish itself by calling itself a mac. Now this was nonsense but it caught on, a mac is a PC, they knew that, but did not want to be associated with being "boring". Over time people developed it, and there was actually one huge difference, mac's used PPC. Not to say you couldn't install a GNU/linux, or unix system on PPC, but as for windows(which held the largest market share, of 90% at the time, it's at 92% now) could not be adapted due to microsoft putting all effort to intel(and amd). Time pased, PPC became less and less popular and apple finally moved on to intel. They recompiled OSX to work with intel. Also OSX is not even developed by apple. It's actually FreeBSD, which they took the kernal and source code and added a GUI(essentially). So now there is absolutely no difference, and to purpose a game on mac is now as easy as PC, it litterally just requires recompiling(more to it then that, but before they would have to re-write nearly all code to use PPC).
TL:DR Anyone who thinks a mac is different from a PC is an idiot.