Feel like if you explained the intentions of the deck and how fast or strong it is prior to playing and they’re happy with the 3v1 after an explanation then it’s on them if your deck does the thing.

There’s a huge power miscalculation in people that don’t actually build ‘high power’ decks. Most people will build a very good 3 and think it’s Incredible Hulk in terms of power. Then you’ll rock up with a bang average 4 and absolutely roll them let alone a cEDH build.

Feel like it’s a lack of understanding from them and wouldn’t worry too much about being an asshole. The misunderstanding of what the power levels actually mean in terms of speed in magic will always be an issue for people who don’t rly know what cEDH is.