The two groups shared the stage on the opening day of the three-day event, where Baker took notice of a poster he saw backstage. It featured a picture of BRING ME THE HORIZON along with the message: "These people are not to be stopped ever. They may not have a pass. They can escort who they want where they want with or without a pass."
The punk rocker took a picture of the flyer and posted it to Instagram, along with the caption: "I'm going to stop these people every time I see them today and tell them how much their band sucks."
BRING ME THE HORIZON drummer Matt Nicholls replied: "I can't imagine being as old as you are and still acting like a 14-year-old girl. Saw you at least ten times and you didn't bat an eye lid. You got bigger things to worry about nowadays anyway, like ya pension, or cold weather. Dickhead."
BRING ME THE HORIZON frontman Oli Sykes added: "Yeah, we are not your enemy, winter is your enemy."
Baker then fired back with another Instagram post in which he took BRING ME THE HORIZON to task for their apparent sense of "entitlement."
He wrote: "It seems you've missed the point entirely. The issue here is entitlement. My post was a comment on your collective delusion that working local crew at a thirty-band festival should be required to memorize your faces to spare you the indignity of breaking stride on the way to your backstage oasis or, even worse, the humiliation of carrying credentials.
"Your literal display of arrogance (and the hilariously unrecognized irony within it) was what I was sharing with my followers. I honestly don't know if your music is bad or good — it's not for old people.
"I meant that you suck as humans. Sorry for the confusion."