Do you say “I’m Jewish” to make people feel uncomfortable when they wish you a merry Christmas

I went grocery shopping at Walmart today and the place was swamped. Walk past this table for cub scout donations. Kid screams in my ear about donating. I walk in, not a single shopping cart. So I go back outside, get another earful. Go up the parking lot to the cart returns, back into the store, kid shouts in my ear a third time so I yelled BAH HUMBUG!