are vegetarians more ethical by not eating meat?

[littleendian]

You still haven't exemplified what the difference was for either of those things by the way, you just said "one is ok, the other is repulsive,"

Animals have a central nervous system which is -- at least for larger mammals -- not much different from our own. This is a strong case for the assumption that these creatures feel pain and desire to live very similarly to humans. An apple does not have a central nervous system with which to register pain, neither has it sense organs to even register painful stimuli, so there is good reason for distinguishing the two.

You are gonna die anyway, does it really follow from that that it is ethically justified to kill you now?

I can serve a purpose, I can help mold and shape this world. A chicken or a cow cannot.

Mentally handicapped people are not shaping this world, they are less "useful" in a purely utilitarian sense, so are the elderly or the disabled. From the argument above you would have to concede less value to their lives than to your own live, which is so much more productive.

From what I've heard from you basically your moral grounds are summed up in one sentence: "I do what I want because I'm stronger and smarter". Fine, but I personally won't base my ethics on something that could be a direct quote from Mein Kampf.