Maybe it's the idiots who bring glass bottles? maybe it's the idiots who cant handle their alcohol? It's mostly idiots ruining it for others. Also if she would have been cool the cops would probably just had her open all the cans and dump them in the sand
She says some stupid shit like "...he said he would call the cops if I tried to take the bottle, so I said "ok, call them" then I left with the bottle. And that's the "exchange" (if that even makes sence)