A Redditor was there at the airport and shared his encounter with Manson as follows:
I just went through the LAX security line with Marilyn Manson. He had “F*CK” scrawled in large letters across the bottom half of his face, with what appeared to be a grease pencil. As we each removed our boots in the security line, he kindly explained that it was not directed at me or anyone else in the airport, but rather at the paparazzi, so that they couldn’t sell any photos of him that they took. He was really apologetic about it, and covered his mouth around young children while apologizing to their parents for exposing their child to profanity.