Once, when Nico, Jason, and Piper picked Hazel up from her school, a mortal girl asked if Hazel and Nico were actually related, because of their opposing skin colours.
"Oh my gods," Piper had replied "you can't just ask someone why they're white!"
The girl had turned beat red and run away.
As soon as they got into Jason's car, Piper and Hazel started laughing like crazy. The guys had absolutely no idea what was so funny, so they just exchanged a few awkward looks.
"Thanks, Piper." Hazel managed between laughs "that girl's been picking on me for weeks."
"Why are you laughing, anyway?" Jason asked them. This set off another wave of giggles.
"Mean Girls." Was the only answer he got.