Ironically, Nami getting mad at Jinbe is evidence that Oda sees Jinbe as closer to the M3 than he does the mid trio.
Nami would never get mad at Franky or Robin - hell, Brook is right there.
Jinbe's chilling because he's thinking of a counter - he's obviously gonna get some decent feats once he's released. It's way too early to flame the man
While at the same time, it speaks more like a joke at the fandom where even Nami is acting like a mouthpiece of the fans who’re disappointed in jinbe.
Nami wouldn’t talk this way to franky or robin, because she didn’t expect more from them, unlike Jinbe who had the warlord title and decades more experience fighting than anyone here, and still got treated as bad as everyone else and let Colon get captured.
I think if even Nami is flaming him, it’s the perfect time to to do it.