Fellow reality TV star Bethenny Frankel chimed in on Pratt's claim by commenting on his post to say she shared the sentiment.
Spencer Pratt, seen here with Heidi Montag, didn't hesitate to name the rudest celebrity he'd ever met. Photo / Supplied
"That's crazy. She was on my talk show and I had a crazy experience also," she wrote. Frankel did not elaborate on what that experience had been.
When fans asked Pratt to share why he thought Kudrow was one of the worst humans, he said he would think about it if the video gained enough attention.
While her reason for being in New Zealand was unclear, she is producing a new season of Who Do You Think You Are?, which traces celebrities’ family histories and often takes stars back to their homelands.