I think that deliberately being as obnoxious as possible is their way of trying to preempt being called out or ridiculed.  Like how they often dye their hair brightly, get nose piercings and tattoos, and wear ugly thick problem glasses.  They know they're ugly and contemptible, so it's almost like they're using reverse psychology by going all-in.  They want to project an image of rebellion, but it's ultimately just a facade for them to hide behind.