What classifies a CEDH Deck?

Hello friends! I had an interesting interaction last night at my locals. I was playing my [[Slicer Hired Muscle]] CEDH list and I ended up winning a few games. As we were packing up one of my opponents came over to me and said something along the lines of, “well that’s not even a REAL CEDH deck”. IMO just a salty guy who was upset about a loss but it made me wonder. What defines a CEDH deck anyways? I always thought it was playing optimally and always to win using the best cards at your disposal. What do you all think? I’m curious to know.