The RAW says that you do not need to follow the RAW. In my experience, it should be left up to the concensus of the players and the alignments of the characters. The DM is there to provide suggestions, but shouldn't control player's actions (as would be necessary to enforce the divying up of equipment).
My groups usually play by first come-first serve basis. Whoever grabs it first, gets it. But if they don't have a use for it, they give it to someone else. Preexisting agreements between characters can alter this, though. For instace, one adventure, one of the characters was leading an expedition and paying the other characters to come with him. He stated ahead of time that all non-coin treasure was his to deal with. The coins could be split evenly between the rest of the group.
If the one player can not agree with the rest of the party, then try to point out that this is not a "rule" as in mechanics. It's just what the characters are doing in game. If he still won't come around or feels cheated, try to mediate a fair system between the players for how things will be done (though I still believe that if you have a Chaotic Evil Rogue/Wizard in the party, you should have no chance of fair distribution).
If the rest of the players feel adament about role-playing the treasure distribution, and the other feels that it should be mechanical, perhaps he is playing with the wrong group.
Some guidelines on alignment and treasure distribution.
Lawful Good
Would prefer a distribution system under which everyone got something equally useful and was most beneficial to the party as a whole. Similar to LN, but would argue for unfair distribution if fair distribution might put someone's life (other than their own) in danger.
Lawful Neutral
Would prefer a fair and even distribution of some kind, preferably including pooling all treasure, identifying all magic, disitrbuting coin, and using round-robin buy offs of any non-mundane treasure. Lacking a predetermined agreement, a LN would rather see unfair distribution than allow arguments to become heated and the possibility of a fight breaking out. A LN may be inclined to become more forceful if someone is obviously trying to abuse the system.
Lawful Evil
Would prefer an agreement made ahead of time with several exceptions of various kinds. For instance, treasure found while scouting or some such thing might be exempt from pooling. Would twist and manipulate the rules to their own advantage, but probably wouldn't blatantly disregard them.
Neutral Good
Would try to equalize the treasure and put it into the hands of those who would most benefit the party unless someone might be put in danger by not getting something.
Neutral
In cases of treasure distribution, the Neutral character would probably be the most likely to go with the flow. If the party has an agreement ahead of time, great. If not, then try for something fair. If that doesn't work then whoever has it, gets it. Might be willing to support the case of magic users who detect or identify items getting to take first stab at it, as they have made it possible to attain and value these items.
Neutral Evil
Will do everything in their power to come out on top. May be willing to threaten other characters if they can get away with it. Would sneak items away while no one was looking, and fight for any distribution method which gave them the most stuff.
Chaotic Good
Would probably want to give treasure to those who have seem shafted recently. Might be a bit selfish within reason.
Chaotic Neutral
The most likely person to actually be AGAINST a predetermined agreement. Would rather go all slipshod, giving to those less fortunate, those in danger, those who did something cool, those who might cause a ruckus if they don't get their way, those who found it, those who identified it, those who can use it, those who deserver it, those whose astrological sign indicates that they are entitled to a windfall, etc. This is generally the way our group rund things. We tend to have strong chaotics (some chaotic neutral, others chaotic good) who the lawful types don't really care to deal with as long as things seem to work out in the end.
Chaotic Evil
Steal, intimidate, murder, cheat, lie, hide, bury, whatever. As long as they get the treasure, they're fine.