Did he over react? Possibly... but then look at it from his side... how many times has someone rolled need on him when they couldn't use the item?
You stated "All had legacy names" so while his behavior might have been rude, you rolling on something without being sure you could use it is just as bad.
As far as time wasted, he wasted just as much time as you did so that is a wash. You didn't get to finish the FP and he didnt get a loot upgrade.