I first noticed that crowd-size claim when people on Twitter started posting side-by-side photos of Martin Luther King's crowd and Trump's. The difference is stark and obvious.
So much guffawing going on! Even the most ardent Trump supporters seemed at a loss for how to respond. A few tried, tweeting essentially, " Nya, nya, nya! Trump bigger! Whoya gonna believe, Jesus's Chosen One, or your lying eyes?"
Then they got laughed at too.
It seems like people are getting tired of swallowing and/or defending Trump's increasingly deranged nonsense.