Alex went on to say: “Do you know what? That’s pathetic. This is absolutely diabolical behaviour.”
He later returned to the show and interviewed Meghan’s dad Thomas Markle alongside co-star Susanna Reid.
Taking to Twitter, he agreed with a Twitter user who branded him a “snowflake”.
In view of his 7.7 million followers, he wrote: “Agreed. I was annoyed, went for a little cool-down, and came back to finish the discussion.”
Good Morning Britain airs weekdays from 6am on ITV.