He's one of the nicest guy in Baki, Rice got extremely lucky
It should be noted that this referenced the scene where Hanayama forcefully kissed the girl who confessed him, and then proceed to show his dong to test that if that girl is "okay" with his brutally blunt personality. Of course she regretted this immidately and runs away.
I'm your new trainer,Hanayama KaoruUm..don't cry...