Jinbe is very humble and doesn't care about the fame and hype. While Sanji likes the fame and hype, which he needs to not let himself completely overshadowed by Zoro in their "rivalry".
So Oda has Sanji doing dick measuring with Jinbei, despite Jinbe not giving a shit to that... and still besting him lmao.
If you remember, this interation started way back in Fishman Island, and continued in Onigashima (remember Sanji claiming he would talent a few seconds to defeat some fodders, and Jinbe doing that in a second, and then the two arguing).
And now the bounty thing.
The fact is that Jinbe doesn't give a like about Sanji's inferiority complex, acting as the reverse of Zoro, who instead fuels it.
That might piss Sanji off even more lmao...