Is it a red flag that my boyfriend joked he’d kill me for a singer?

We were talking about the singer and I commented that he must be a big fan, and he replied “oh, I’d kill you for him” implying that he’s a huge fan I guess.

It really rubbed me the wrong way, but I don’t know what to make of it or if I’m overthinking it.

Is it a red flag that my boyfriend joked he’d kill me for a singer?
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