Are quirks officially counted as disadvantages?

[Langy]

Labeling Ze's argument as a personal attack

He isn't labeling Ze's argument as a personal attack, only his method of arguing.

And face it, Ze's method of arguing is a personal attack. He's saying anyone and everyone who ever uses a disadvantage limit, which is just as much a core rule of GURPS as character point totals or starting wealth levels, is a bad GM.