I think the most typical cause of argument is a combination of the "brilliant idea" and the response:
When one comes up with something they think is either revolutional or just plain genius, but it is met with a negative response like "No, my idea is better," then the sparks start to fly. If the one listening were to say, "That is a brilliant idea . . ." to start with, then this mostly disarms the originator of the idea, and gives him/her closure. If it so be that the listener believes he/she has a better idea, he/she would be wise in asking, "So how would you justify the use of ________, and what would happen if you changed A to B?"
I think a person needs some type of comment that affirms their competency, no matter what follows next. If not, it's fodder for arguments.