When someone tells you this, this means that they care about you and that they really appreciate that certain thing about you. cherish the people who say those and make sure you say something nice back;)
“I like to make people laugh”- You
“You know what, that’s my favorite thing about you”-him/her
Nijisanji EN act toward Luxiem
And yet they say there's no favoritism act going on in this fandom
"I can't believe the admins let Ahna get away with it again, such favoritism..."
Means that this person you are referring to, is your all, it’s the one.
“Don’t be gelous babe, you’re my lil favorite. “