, or otherwise slandering
any of the line of Macintosh
computers manufactured by Apple Computer
Mac-bashing usually is mean-spirited in intent, and is designed to make fanatical Mac users feel insulted, or perhaps make them question their beliefs.
Ultimately, though, I suspect it's counter-productive, in that you're not going to change anyone's mind by Mac-bashing. You'll make the Mac haters feel smug, the Mac lovers mad, and that's about it.
However, constructive criticism or analysis of the Macintosh design or philosophy, or the design of MacOS is reasonable as long as it's done in a fair manner.