Comments on the AMEX Black Card

After getting almost no comments from cashiers about my AMEX Black Card (aka Centurion Card) on the first 20+ purchases, the last 5 or 6 salespeople have all commented. All of them said basically the same thing and I have no idea how to reply. What they said was, “this is a heavy card”, now the Card is made out of titanium and is quite a bit heavier than a normal credit card so it’s a logical response from them. My issue is that they don’t say it as statement, they ask it like a question and seem to expect me to say something back. Am I supposed to say, “yes, that is the Amex black card, one of the most exclusive cards in the world that only extremely wealthy people can get” or something stuck up like that? That is not my style, I don’t mind getting undeserved respect for having the card but I’m not a complete asshole (feel free to agree with me on this). Any ideas? (No, I will not say “Kiss my black AMEX”)