Hey BrokenChains.
I don't know what Bible your friend is reading from, but he is clearly misguided.
For the record, I have been an Adventist for over 20 years and have eaten meat all of my life.

My dad is an avid hunter and we lived off deer, antelope, moose and elk meat for most of my childhood. Buffalo is also very good, a nice lean meat. Here in Canada, wild meat is a staple in most areas.
I found it was very difficult to give up certain foods when I joined the SDA church. I loved BBQ pork spareribs, bacon and sausage. I was also a seafood fanatic. Shrimp and lobster were the most difficult to give up from that food-group. Deep fried shrimp with sweet and sour sauce at the Chinese restaurant buffet was one of my favourites.
I also tried calimari (squid) as well as escargot (snails) but it was a one time thing, as neither really appealed to me.
Although the escargot was alright fried in garlic butter...
There are definitely extremist people in the SDA church who have elevated diet to salvific level, no doubt. I have encountered many of them in my time and I have been condemned to hell by them for not giving up my chicken and beef

Whatever.
They are not my conscience, they are not my God and I do not have to answer to them.
The basis for thier bold judgmentalism can be found in some strong statements EGW made regarding meat and translation to Heaven. I am on record as completely disagreeing with her on this point BTW.
I know many right-wing vegan Adventists who actually believe they are morally superior to meat-eaters and spiritually on a higher plane. Sounds more like pagan Hindu philosophy (Hindu's are devout vegans) than Christian belief to me.
Finally, I think we are treading on shaky ground when we claim the Levitical food laws on moral grounds rather than health reasons. We are then guilty, and rightly so, of the charges that mainline Evangelicals level against us, that we pick and choose from the ceremonial laws. The term 'unclean' is used in the Old Testament in a ceremonial sense, and we have to be careful as Adventists when we bandy about that term so freely. Unless we are still engaging in the ceremonial rituals of the Jews, there really is no reason for using it. It should always be specified that we mean 'unclean' in the sense that the animals are scavengers and are intrinsically filthy animals.
The official position of the SDA church is that clean meats are not prohibited, unclean foods are and vegetarianism is strongly encouraged but not required.
Any righteousness-by-diet fanatics in the church that deviate from these guidelines have no basis for thier claims.