I feel like she was just saying "He's the #1" as in he's the crazy one who's always waiting for her because of his ultra dedication. She just worded it nicely and the fan took it as her saying, "He's the best fan"
Sort of like the Maikheeb of the KatyKats. He's certainly not the best fan, but he's the one that is ALWAYS there, ALWAYS waiting. That's what she meant, I think