I got folliculitis after a back waxing (honey based wax) at a spa. does this imply contaminated wax, or is this a common reaction for some people?

Folliculitis: Either can occur. It is more probable that these organisms were already present on the surface of your skin, but without cultures prior to and after your episode it is impossible for me to implicate the spa. This may be a question for your local health department, since if it has occurred and been complained of by others they may want to investigate. Good luck.