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Nowhere in that diatribe do you actually give a reason to stop eating meat.
Oh, you got told
"It's disgusting" - that's an opinion. I think it's delicious, personally. Not only that, I also think it's acceptable, and biologically, we're obviously adapted to doing so. When you're trying to make a point, opinions don't really matter because they don't provide any sort of REASONING to why the statement should be considered right or wrong.
The closest thing to reasoning he had was an obscure television reference
"Eating animals is like eating humans" - This is just an opinion, so it doesn't really matter in the larger scheme of things. You think it's like eating people. Personally, I think it's not that much alike, but whatever. Not really relevant either way.
Cannibalism is severely underrated.
"I believe it's in an animal's nature to eat from other animals, so I don't blame them" - well, that's great, because you just argued against your own case. If you didn't notice, humans; homo sapiens, are animals. Specifically, we're primates, of the class Mammalia, phylum Chordata, kingdom Animalia.
Again, told. rofl
If animals are allowed to eat other animals, then man, by way of being an animal (being sapient and self-aware does not exclude us from being animals, before you suggest it) are allowed to eat animals.
Sometimes I wonder about the sentience of humans
I have something for you to do: Go to your bathroom. Look in the mirror. Smile, open your mouth, whatever.
Assuming you have your natural teeth, you should see about four pointed teeth in there. Those are called incisors. We have them, and animals such as tigers, dogs, and cats have their own equivalent. Do you know what they are there for? For the express purpose of piercing and cutting into meat; only omnivores (such as ourselves) and carnivores (animals that only eat meat) have them. Herbivores usually only have flat teeth for grinding plant matter.
I personally LOVE my incisors. The front teeth are all the teeth I really need...I think.
As described above, we have these teeth - oh, and don't forget the ability to DIGEST MEAT - for a reason. Because meat has been a foodsource for mankind since before the dawn of history. We're biologically designed to eat both animal and plant matter, and to draw nutrients from both.
Actually that's only partially true. While we are designed to be capable of absorbing the nutrients, we aren't however designed to get the full amount of nutrients from anything. The one bad quality of omnivores.
If, as you say, we're not supposed to eat meat, then we would simply not be biologically capable of it in any feasible amount. If we weren't supposed to eat meat, we would never do so in the first place, why would we eat meat if not because evolution has biologically designed us to do so? The very fact that we have the ability to eat meat, and do, is a sign that it's perfectly natural and fine to do so.
Not really, only in moderation. Eating anything puts strain on the intestines and can result in the shortening your overall lifespan.
Now, what isn't fine is animal cruelty. Cockfights, dog fights, killing animals for sport without using their meat and other products, penning animals up for their entire lives, torturing them. Yes, that's all very wrong. However, eating meat is obviously perfectly reasonable and fine, because we're biologically adapted to do so.
If you think that's cruel you should see the lives of some of the animals we do eat.
If people have ethical problems with eating meat because of animal abuse issues, okay, that's you're prerogative. No problems there, what someone does is their own business. But if you think we, as a species, are not supposed to eat meat, you'd be wrong.
Humans could also survive taking in nutrients from the air like filter feeders if we were adapted properly to do so or possibly in the future 'liquid light'. We'd be adapted for that when it's developed.
tl;dr: What you do is your own business, but humans as a species can eat meat, there's nothing wrong with it; we're biologically adapted to doing so. So no, eating meat is not "wrong" at all.
which makes me wonder why we don't have soylent green.

Soy, lentils, almonds, cashews, peanuts, and other certain foods are considered by many vegans to be acceptable alternative protein sources. Not as protein-rich as dairy or meat, but soy especially can provide enough protein. Of course, soy also contains pro-estrogen compounds, so large amounts is.. not.. advised for men >.>

Eating a diet of solely plants or solely animal products is going to leave you with some deficiencies, vitamin-wise. We were meant to survive on fruits, vegetables, meat, and a few miscellaneous food sources like nuts and so forth.

Refusing to eat any particular food group out of those three (veggies, fruit, meat) is potentially robbing your body of important nutrients.