You should use the filter or filters that give you the effect you want for a given picture. Red filters and polarizing filters do totally different things. Polarizers change the direction of light rays entering the lens, and colored filters *effectively* (not *actually*) change the spectral sensitivity of your film.
For 95% of pix, I don't use filters. If I had to make some sort of blanket rule for myself, based on this examination of what I do naturally, it would be to use NO filters. However, who needs to make arbitrary blanket rules? I use filters every now and then, depending on the picture. Usually yellow, yellow-green, or orange. Sometimes blue or red (and very very very rarely will I use red if there is a blue sky in the composition). I have even used a polarizer a handful of times, though they frustrate me trying to figure out where to set the darned thing. I hate having to fiddle when trying to catch a certain light.
As for the "red should not be used for color" statement...well, yes, it should be, if you want your entire picture to be tinted red!