Where to begin?
As you clearly don't care about constructive criticism, this is just going to be one long review of me stating my personal views and opinions of the above flash. Weather or not you take anything from it is your own business.
Putting it simply, it could use a bit of work. The beginning is a bit...flat. You might consider adding even a single line of dialog between Ed and Al exchanging looks. Speaking of looks, the expressions are weak. With Al it looks more like "Oh dear, someone spilled juice on my good shirt." rather than "Holy crap, I'm being deconstructed!" and Ed looks more like he scraped a knee rather than lost his leg, something you may want to work on in the future. Even the action isn't very aesthetically pleasing, if you were trying to emulate the series a flash of light or even a bright glow from the chalkboard after the number "0" had been drawn would have worked rather than the hands just reaching out from it. These are only examples of things that could be improved to make the flash seem more impressive. A voice actor wouldn't have killed you either, just look around newgrounds and you're bound to find one.
As a fan of the actual anime (both the original and Brotherhood) I wasn't terribly impressed. There was very little originality, even in following the events of the show there were parts that went missing that could have been added to not only lengthen the flash but add more action as a whole. Was it suppose to be a parody? I didn't really find it amusing, mostly it made me want to watch Fullmetal, but not much else.
In closing, it could use some work. Two months of flash experience isn't a lot to start with, I might suggest fiddling around and really fine-tuning things before making it public, and it only took you four days to make? Given it isn't a terrible animation, for the time you put into it, but it's not great. A good flash can take weeks, even months, to finish or until the artist is satisfied that he/she has done their best and will be proud of the works they put out.
Stepping into the creative community with a bad attitude will not help you in the long run, you'll only end up getting mostly useless posts about how you're a jerk and your flash sucks, it is not a good way to start. Coming in with little experience in the field and demanding respect from your 'peers' will only get you shunned, nobody will want to see future flashes from someone who doesn't care about the views of the audience he is presenting to. Aslo, if you wonder why everyone thinks that way, maybe you shouldn't provoke people by telling them their opinions don't count right from the start. This is the internet, they will give you their opinions weather you want them or not, if you come off as less aggressive maybe the viewers would be more inclined to be constructive rather than simply say "It sucks" just so you can retaliate in the same fashion.
I hope this has been enlightening, even slightly, as it wasn't written with the intent of hostility toward you or your work. If anything it's a reminder that the other members, artists/animators or not, are the ones who rate your flash. Even if they have no experience on the subject they still get to decide if your work is 'good' or not based on their own opinions, something to keep in mind for next time.