This guy doesn't know that trades for art and fursuits and whatnot happens all the time, people often freely give out stickers, also there are centralized avenues of people buying and selling goods and services. Take the dealer's den website and the spaces at conventions
As stupid as I think lefties are for trying to claim the fandom as a whole by gatekeeping it based on sexual identity, I believe there's a better, more valid argument to be made when it comes to excluding communists from furry communities.
The furry fandom functions in a strongly anarcho-capitalist manner because it operates through decentralized, voluntary exchanges in which creators trade their labor in the form of art, fursuits and other goods or services for money, while participants form voluntary private communities.
Communism rejects private property, monetary exchange, and the non-aggression principle in favor of collective control.
As a result, communism is incompatible with these values and principles, so individuals and private groups within the fandom have every right and incentive to withhold association from those who advocate for it or identify as communists.