Generally very radical vegans also have a right to their own community, however I also think there should be spaces for less radical veganism as well. It seems that currently there's none of those available, or maybe the general hostility of social media against vegans makes any of their more tolerant spaces eventually close ranks to protect their sanity. Unfortunately vegan spaces are constantly brigaded by trolls so it's understandable they have a very short fuse, and a lot of people get caught in the cross-fire.
I think the only solution here would be for a new vegan community with a focus on debate with non-vegans. However it will be tricky to find the right moderators for it who either won't be non-vegans themselves and therefore support a flood of concern-trolls and bad faith arguments, or be vegans that won't get immediately burnt out.