You said it, dude.
When it was explained to him that food insecurity is in fact a major issue in many Indigenous communities, due in part to exorbitant prices in grocery stores, dude just said he believed that vegan food should be supplied to everyone for free. He followed this up by going on a tangent about how he is not racist because he tells everyone not to eat meat. Trying to explain to him that by telling Indigenous people how to live their lives, he was falling into a well established racist pattern got nowhere either.
But then, the guy describes himself as a Marxist vegan, and his Twitter feed includes a rant about how non-vegan Marxists are misguided so he seems to be heavily into ideological purity.