"And I repeat myself, we switch over to vegetarian, the bovine species will CEASE TO EXIST. They will go extinct except for the ones in zoos."
So, what, you think we couldn't figure out something for them? Come on. I think the cow population is much better existing only in zoos than the conditions they're in now.
" Hundred cows or one person? I don't know how it's a hard choice."
It doesn't have to be either of them. There is NO reason that you must kill those 100 cows.
"When it all comes down to it, we are so far superior to almost any species of animal that you could argue our right to drive them into extinction at our convenience (could, I won't because I don't believe that helps humans survive better, but still could)."
But you haven't argued that AT ALL. You haven't support that one iota other than just because we could. Besides that, why are we so superior, just because we can talk? Because we're smarter? Why are those the qualities that make us superior? That type of ego centricism makes me ill.
"Find the first person who refuses to kill ants that have infected their home, never killed a spider or roach in his or her life, and would not swat a mosquito or fly, and I show you the only person that has any right to say eating meat is wrong."
Your arguments aren't consistant. First you say we're superior, now you say that all life is equal, so people who kill ants can't say that eating meat is wrong. There's a huge difference between killing ants and killing animals who obviously have some intelligence.