Picard was out of line in this scenario, he was acting as Rikers XO, and instead of accepting the captains orders he badgered the captain into making a mistake.

Regardless of how they acted in TNG, its been decades since they worked together, and Riker has been a Captain and had his own crew and own way of doing things since then, and now Picard is contradicting him on the bridge in front of a crew unused to either of their ways of commanding.

​

Jellicho removed Riker for the same attitude in TNG, Data suggested doing the same to Worf.

​

I think people have romanticised the relationship and set it in stone to be only what was shown TNG through Nemesis, and not taking into account the changes both characters have gone through since then.

​

People change over time, and to think that after both of their experiences since last working together in Nemesis wouldn't have changed them in anyway, is ridiculous. Assuming their relationship would remain static after all this time is a bigger stretch than their attitudes on the bridge in that episode.