Sounds like a player problem to me.
Regardless of the experience level of the DM, although a more experienced DM can usually find it easier to "justify" their rulings, if the DM has made it clear her expectations and "rules" from the beginning and everyone playing has agreed that is what they will be playing to then the trouble player needs to get inline or take a break from the game to avoid disrupting the fun of the others.
This is easier said than done and a new DM has a lot of trouble trying to "convince" people of their "worth" and "viability" as DM. THis is the time for the other players to take a stand and either support the DM or "convince" the DM to step down.
Now as a variant on this - have the "troublesome" player take a turn at being DM and see what happens. . .
Regardless of the experience level of the DM, although a more experienced DM can usually find it easier to "justify" their rulings, if the DM has made it clear her expectations and "rules" from the beginning and everyone playing has agreed that is what they will be playing to then the trouble player needs to get inline or take a break from the game to avoid disrupting the fun of the others.
This is easier said than done and a new DM has a lot of trouble trying to "convince" people of their "worth" and "viability" as DM. THis is the time for the other players to take a stand and either support the DM or "convince" the DM to step down.
Now as a variant on this - have the "troublesome" player take a turn at being DM and see what happens. . .