To answer the OP: When you live in a basement and cannot get dates... you have to do something! Why not nitpick?
^ Quite true. It's like when sports fans boo somebody. You don't waste time booing players you don't like, or at least respect. Curt Schilling said once (about Yankee fans) - "If they boo you, as a visiting player, that just means you don't suck."
Also fans will often boo those *on their own team* for not performing up to standards. Javier Vazquez, for example.
Probably doesn't help that the plot holes and inconsistancies in Star Trek are more glaring than any other fiction.
Honestly, I think you'll find fans of anything love to nitpick whatever they are a fan of. It's all part of the fun!
Also think of when you last got bad service (or bad food) at your favorite restaurant. As much as you might love the place, you're still going to complain if you're not treated well.
I'd just figure the peeps serving were just having a stressful day is all. Unless it happened more than once. I'd go back to my food replicator at that point.
I don´t anymore. But when I did it was because something contradicted something stated earlier in the Trek Universe.
I hate to generalize, but it seems to me most "hardcore" fans of any genre work have some kind of obsessive-compulsive or "nitpicky" personalities. Sounds like there's a good psychological study to be done here...