Breadcrumb is legally an adult and has been for a while. (Obviously, he's essentially the "fake cookie" [not counting AI Cookie] he'd obviously be an adult.) So anything that occurs during that party game is neither malicious nor illegal, Breadcrumb is simply surprised it's occurring in the first place.
The slightly transparent image on top of the fakin' it: all night long logo is inspired by the "the faker is still at large" image seen in the official trailer for the party pack (Modified, especially with emotions. I did not expect bro to be on this party pack at all. But hey uh.. More online compatibility at least..? More cookie voicelines.. Uh yayy..?)