It’s incredible that crowd size is still such a touchy subject for him. It was the first lie that he had Sean Spicer tell, and it’s still a soft spot of his to this day. Gotta keep the Kamala fever up!
I don't think it's incredible at all. As a narcissist there are few things he values more than people liking him, and crowd size is (to him) the most direct representation or measure of it.