You already failed by missing the point.
You're not supposed to get FLCL the first time. Or maybe even the second. But after a few rewatches, everything should become fairly clear. And the pleasure's in the rewatching, because FLCL is essentially awesomeness in a can. Just sit back, turn off your brain, and embrace the insanity.
I am the one missing the point? 
My point is that, by utterly closing your mind to any show that requires more than one viewing in order to completely understand, you'll never get any of the points that FLCL presents, and you'll wind up missing out on a whole list of other fantastic series in the process. Personally, I find that series which just about require at least one more viewing are those I like the most, because of how highly rewatchable they are and how much they reward the attentive viewer. I've sat through FLCL at least ten times, and each time, I've managed to catch at least one Easter egg I'd never noticed before, or pick up on some hilarious bit of dialogue that I'd glossed over...and that's not even mentioning the more thematic elements of it. If a director can keep you coming back and picking up on new material, they've done a damn good job.
IMHO FLCL is a lot like Pulp Fiction. I tried watching it as a kid, and didn't "get" it all.... I was not in the right frame of mind. FLCL can't be watched with expectations of a "coherent, concise" message.
The whole OVA is an allegory about leaving childhood. The protagonist faces issues that were simply "not part of childhood", like guns, violence,
real (trusted) friends and relationships, dealing with the opposite sex and sexual tension. This is done in a nonsensical, cheek-in-tongue manner that thanfully doesn't take itself seriously.
Naota tries to be "serious" and "grown up" all the time as a defense mechanism against his dysfunctional family and utterly irresponsible father. What he doesn't realize is that he's still just a child and instead being a grown up is just a child who "plays a grown up".
The robots, Medical Mechanika, Atoms and so on are a more literal allusion to his repressed urges, the hormonal urges of a teenager and finally the repressed feelings his situation creates in him. They literally burst out of his head, out of his subconsciousness and wreak havoc upon his little make-believe life of "responsible boredom". Only when he finally accepts his urges, his "repressed self" is when he can truly grow up....
...and KICK ASS!
Literally, and allegorically...
...to an awesome rock soundtrack by the "Pillows"!
* Flaser hums to himself....
ORANGE no SLIDE utsusu sora
SPONGE no PRIDE burasakete
SPIDER
kike totta sono yokan wa
kakusanakuta tte ii n da
iro no tsuita yume mitai na
....
....
Orange slide, the sky that it reflects
Sponge's pride, being dangled
Spider
The apprehension that was caught alive
It's okay even if I don't hide it
I want to have colored dreams
All in all the main reason why I think Trashman doesn't "get" FLCL is that it's a very Avant-garde OVA.