Im sorry but pretty much every person against veganism I've spoken to really just boils down to them wanting to eat meat while at the same time trying to maintain some form of moral high ground. There isn't any real argument at this point against veganism aside from culture, which can be changed. Admittedly, veganism is one of the last things we should be concerned about (because animal liberation isn't possible until socialism wins globally) but as a personal decision it's like one of the few things within your power if you are able to support it financially.

As socialists, if we have a communist society we're not keeping cows in cages so you can "feel full" after a meal. That's bloody stupid. Nor are we committing valuable space so we can "ethically" raise cows to feed a growing planetary population of billions upon billions of humans.

And this is coming from someone who still eats meat. The way we consume it will have to drastically change (reduce) for multiple reasons. If you like meat, just say you like meat, but don't google "veganism bad" when many of the highest level athletes in the world are vegan. You don't have to justify yourself buying a cheeseburger because veganism or your lack of veganism is just a drop in the pond. Just admit your vegan friend is a tiny bit more morally superior than you are and enjoy your fuckin cheeseburger.