Ye ol’ snaggletooth.
The of the things the batclan hates, is when they have to work a mission during the day -- in the sunlight. Because when they finally take off their masks, there is a defined tan or sunburn. Bruce and Duke (sometimes Tim, depends on which suit) only have to worrying about the area around their mouth. Jason and Cass have eliminated the probably by having fully covering masks/helmet. But Dick, Damian, Steph, and Barb...? They have more to worry about. Including laughter from Cass and Jay.