Despite my age (now 38) I actually dodged dealing with adult and semi-adult fanboys entirely until the Dreamcast launch. My initiation into seeing an actual crazy ass fanboy was in Gamestop, a few weeks before the Dreamcast launch, over this:
Topic: SoulCalibur port for Dreamcast
Fanboy rant: this guy gets going on about how FUCKING NAMCO is against THE SEGA (he said "THE SEGA") because of their fucking shitty betrayal with SoulCalibur. He's going on to the two guys on duty.
His rational: all PROPER Namco fighting game ports to consoles have the "TRUE NAMCO CEEJAY MOVIE". But SoulCalibur had a shitty "GRAPHICS OPENING". It didn't have the epic openings of Tekken 2, or 3, or Soul Edge.
Gamestop guy says this is because they're showing off the Dreamcast graphics, and have the feature to let you edit the intro to customize it. Dreamcast discs are even bigger than PS1 discs, so they had plenty of space for even more CG movies if they'd wanted to use them. But the Dreamcast is so powerful it's not required.
Fanboy is not happy. He just gets angrier and starts in about how "EVERYONE IS AGAINST THE SEGA AND WANTS DREAMCAST TO FAIL". Namco using "LOW GRADE GRAPHICS" for the SoulCalibur opening is, in fact, so that they can release SoulCalibur on PS2 the day it launches, where it will have full "CEEJAY" opening, and endings, and more characters, and better graphics. Namco is just releasing an "INSULTING" version of SoulCalibur on Dreamcast "BECAUSE OF THE CONTRACT". He is not clear on what this "contract" is or how it came about, or why Namco is bound to release SoulCalibur against their will on Dreamcast.
So, guy eventually walks away and pretends to look at stuff, then leaves. I never said a word but the guy at the counter saw me and others listening to this. He said the SEGAGUY never ever bought anything (including Sega products), just came in every day to wait around to rant about stuff like that, and then left.
And I think that's when I got the first real demonstration of how true fanboyism works. I always felt it was telling that the fanboy never actually bought stuff either (like supporting the companies he ranted about).