He didn't want to simply wear an altered T-shirt, mind you. All the laws of basic decency and good taste couldn't stop him from doing that. He wanted to sell the shirts, which were confusingly modified to add "Bieber" to the declaration "Bigger Than Satan" on the back. It doesn't take a deep knowledge of either the music industry or copyright law to figure that Bieber wouldn't be able to get away with that without signing a generous contract with the other party. But Manson decided to get more out of the deal by starting the most baffling one-sided feud in music history.
In an embarrassingly childish interview following the incident, Manson said that Bieber "was [already] wearing the shirt that had his name on my shirt, and he said to me, 'I made you relevant again.'" Just to remind us of how much of a tough guy he is, Manson added, "Bad mistake to say to me ... He was a real touchy-feely guy, too, like, 'yo yo bro!' and touches you when he's talking. I'm like, 'You need to stand down, you're dick height on me, OK?'" To cement the impression that he needs to one-up someone who was barely an adult, Manson laughed about how he'd jokingly told Bieber he'd stop by an upcoming concert to jam, and Bieber "believed that I'd show up, because he was that stupid."
We don't often feel sorry for Justin Bieber, but according to texts Manson subsequently shared during an interview with Howard Stern, the poor guy felt genuinely hurt and confused. Unless he was being seriously two-faced and trying to gaslight Manson into believing he never insulted him, he really thought that they had gotten along great.
Marilyn Manson, via Junkee