If there's anyone who can draw evil moustaches, its Ottley!
Yeah, it was the girl that texted Billy and told him to come to her party, she just obviously didn't know that he's a lizard boy so of course freaked out along with everyone else when he suddenly showed up. There was no setup, just misunderstanding, with Taskmaster and Black Ant just accidentally bumping into him, they even said how they couldn't find the Lizard again after Spider-Man stopped them.