Not my story, but one a metalhead at AudioFeed 2019 shared with me: he went to a Deicide concert in the 90's (when Deicide were still rly insane), and he was wearing a Living Sacrifice shirt (a Christian industrial metal band).
He went to Glen Benton (the frontman) and asked him to sign his record, but Glen Benton recognized the guy's shirt as a Christian band and was, like, actually upset: "Why are you even here? You know we worship Satan, right?"
The guy's response: "That's your problem!"
Glen signed his record!