Knicks fans dunked on the rival Spurs’ hometown ahead of the NBA Finals — saying they remember the Alamo but little else about the fire ant-infested, dust trap of a city. Orange-and-blue fanatics on barstools and behind bar counters trash-talked the second-rate Texas city that has “nothing going on” beyond the Spurs’ postseason run, which has set them on a collision course with the Knicks.