John's just a newly recruited member of the Brotherhood back home. Didn't really get a chance to have some tea and small chit-chat with the Magneto who saw his potential. In a funny twist of fate, it's this version present in fae realm who he got to know more, who showed him that he's worth being loyal to.

When she stares him down and asks him about these versions he encountered, John gives her a glare. He doesn't like being ordered around, not by anyone other than Erik. So, with his glare making way to a small smirk, he turns around.

"That's something you'd just have to find out, lady." And he leaves.