Who said I am arguing with cashier and make scene ??? I did not say that. It's just somebody's imagination. I have already said that we can always have polite conversation about the issue plus I am not picking up on cashiers ever. I know they are not decision makers when it comes to which card will be accepted. But you've got to remember that many times the cashier is actually the business owner and that's when I try to express my opinion about the card acceptance. It does not have to be the scene. You guys have created completely wrong picture of me. If I have different opinion about something, then prove me wrong and move on. No one so far has answered the OP's question that makes sense as why some businesses take Visa, MC and Discover but not AmEx. In my opinion it's poorly made decision as the cost differences are minimal and consequences are drastical. All business owners just love the huge potentials of the big payment networks in the terms of increased revenue by maximazing the customer base but some do not like to pay the fee to the payment networks for their services. Imagine how much less revenue they would face if only cash was acceptable. You need to pay to play, eat that cost and do the math.
Now I remember why I hated working in retail so much. 
Anyway, chacun a son gout; it's a free country; and all that.
If someone only wants to use an AmEx, fine, whatever. No one is forcing anyone to use any particular payment method. I use my Blue Cash Preferred at regular grocery stores because I seriously * puffy heart * my 6% cash back, but my little neighborhood market with the incredible meat counter only takes MC and Visa, so they get my BofA 3-2-1. I'm a big believer in supporting local mom-and-pop businesses when I can, and they know me by name, and they tell me when they have something that I like. So I get 2% instead of 6% back. The sun continues to rise the next morning.
Presumably, if someone is bound and determined to use nothing but AmEx, whatever they wanted can be bought elsewhere.
If not, then we have a fine example of "cutting off your nose to spite your face." 
