You know, that guy at the end is probably one of the people given the nickname of Dragon. And if I had to guess he's probably trying to court her. (Though that's a bit more obvious)
I think the MC was tickled off because they were calling them Poison phoenix and young phoenix, which implies he is a rank below her, which also explains why she was smug about it
"There's no practical difference between a truth you won't believe and a lie that you will. Either way, you're going to fuck off and do the wrong thing."
I'm looking forward to how flustered they'll be when it finally hits them that he really is telling the truth.