I think sometimes people advertise Black Mirror in a wrong way? I thought it was going to be scary as well but it's not a horror show. It's more like cautionary tales, and you definitely don't need to watch all of them since some are a bit scary.
But for example, 4x01 USS Callister is one of my favourites and nothing really scary happens in it (imo). Since they're very fresh in my memory, let me know what the borderline is of scary/uncomfortable and I can make you a list of ones you probably shouldn't watch.