Fan Ejected For Heckling Tristan Thompson

An NBA fan was removed from his courtside seat on Sunday ... and it's all 'cause he allegedly hurled Kardashian heckles at Tristan Thompson.

For real.

Here's the deal ... during the fourth quarter of the Kings vs. Grizzlies game in Memphis, Thompson became visibly upset with a fan sitting courtside, and pointed the man out to refs and stadium staffers.

Video from the scene shows security spoke with the fan ... and then returned just seconds later to give the guy the boot from the arena.

Afterward, Grizzlies beat writer Drew Hill reported the commotion all stemmed from some Kardashian comments the man had aimed at Thompson, who has a child with Khloe Kardashian.