When Hawkeye's LARPer friends are trying to evacuate the building, no one listens to them. But as soon as they put on their costumes, everyone starts following their orders.
While most likely unintentional, this mirrors what Mysterio says in FFH, about how no one listens to you unless you've got a flashy costume or some sort of superpowers. Kinda sad that that ended up being true, but it's a fun detail either way.