I have found one thing to be infallibly true, after many years.
When the first statement out of a person's mouth is "I know computers, I've been an IT/Developer/Systems Designer/Etc for XX years", they actually have no clue.
I recently had a guy arguing with me on a game forum that I provide tech support for. This moron claimed that he was a 30 year IT vet (um.....ok) and couldn't figure out why the MMORPG he was playing would only hit 30fps. I explained that the game was hard-coded with a 30fps cap, in order to lighten the load on the servers (i.e. no wait time like WoW).
He argued that he had a 6800GT video card, and that there was no reason HE should be capped. He also had 4gb of RAM, which should increase his FPS exponentialy *sp* but did not. Again, I explained that the MMORPG in question was hard-capped at 30fps. It also only uses 70% of your total system RAM, up to 1gb (so a max of 700mb at full settings, never any more).
I could keep going, but let's just say this guy's "edumacated" thread went on for 4 pages, before the developers banned him for being an idiot.