How to deal with a pilot trying to be clever ?
Insist on proper procedure being completed - even if there are no ECAM actions, one Airbus pilot flies, navigates and communicates, the other dons the F/E hat, reviews status, consults QRH/FCOM etc.
If his cleverness is limited to words only, while his actions are appropriate for the situation - no action required until "Parking checklist" is completed.
After a/c is chocked and engines are off, administer polite but firm lesson on how it's nice to be pedantic but application of pedantry requires considerable forethought. Lack thereof can lead to misapplication and entirely unwanted results.
As for SOP adherence: I found no better explanation of its importance than one found in DP Davies preface to second edition of "Handling the big jets"