I have the same experience with all my metal body laptops (mb pro 16, mb pro 2013, Asus zenbook) Grouding doesn't seem to matter (Asus zenbook has no grounding

I have the same experience with all my metal body laptops (mb pro 16, mb pro 2013, Asus zenbook) Grouding doesn't seem to matter (Asus zenbook has no grounding on the usb-c charger)