i would have acted the same way, honestly. if theres one thing i CANNOT stand, its someone asking me a question if i have already answered it. case in point:

MV: i have a maf

You: Hey, do you have a MAF?

i would flip out, too. not only that, but the quick barage of questions to follow would have driven me insane.. especially but i am an extremely busy person and i know Matt is, too.. we dont have time to answer a million dumb questions. you could have made it much simpler and less annoying by just coming out and saying:

"hey is this mattback? I need to get the S14SR Maf from you.. it comes with the plug, right?"

and boom. 10 minutes of our lives not sucked through our faces. theres a reason why matt posted this convo and stated how NOT to buy parts. think about what it is you need to say and simplify it. i go through things like this everyday and litteraly do not have time for ignorant questions. this isnt me being a dick, but rather illustrating the fact that i dont have time in my busy schedule to answer questions that either were already answered or that the person couild answer on their own.