Rapunzel's Tangled Adventure, Season 1

Eugene:
You don't know what "boo" means, do you?

Princess Rapunzel:
Of course I do! It's a cheer like "hooray" or "yea", right? No? Then what does "boo" mean?

(Back in Rapunzel's room)

Cassandra:
It means someone hates you.

Princess Rapunzel:
Why wouldn't someone like me? What could I have done to this person?

Eugene:
"Rapunzel, who cares? Not everyone has to like you. Its part of life."

Cassandra:
"Eugene's right. I someone couldn't like you for any number of reasons. Like you have a stupid goatee that makes you look ridiculous."

Eugene:
"Uh, Cass, it's hard to take your insults seriously when you're holding that thing."