The interview took place on 13 March 2012, about 3 weeks into a “relentless” (Louis’ personal description) American concert, radio and promo tour. They were exhausted. This was 4 days before Eleanor showed up for her public, scheduled NYC trip, and given the ongoing theory that Simon/the label had a bigger role to play in the closet as a marketing strategy, this stood out to me this time around.
In short, I think Louis was exhausted, irritated at the same identical radio interviews, the monotonous questions, the schedule, the new and upsetting ways they were separating him and Harry and the impending Eleanor trip and he just let his frustration and irritation show as Zayn answered a question about Simon.
(Disclaimer: Louis wasn’t overly bubbly in this interview at all, but he was particularly sour-faced during this exchange about Simon Cowell).