T-Rex: I concede that, sometimes, it's nice to be polite!
T-Rex: However!

T-Rex: I also believe that it's NOT nice to be insincere. I am in conflict!

T-Rex: This is because there are situations in which being polite implies being insincere. For example, I may think someone looks pretty ridiculous in their fancy new hat, but if they ask me what I think, I'll try to say SOMETHING positive about it! In order not to hurt their feelings, I am polite in sharing my opinion.

Utahraptor: But it's understood that people will try to be polite, so this insincerity is okay!
T-Rex: Huh?

T-Rex: If everyone knows people are being insincere, then what's the point of politeness? We end up in the same place, semantically speaking.
Utahraptor: Not really! Since there is always SOME doubt as to whether someone is just being polite, one can always take something as a compliment!

T-Rex: Hold that thought.
T-Rex: HEY YOU! ACROSS THE STREET!
T-Rex: I LIKE YOUR FRIGGIN' HAT!