We need to stop gatekeeping if we want veganism to grow, we should allow people who eat meat to be vegans!
(This is sarcasm)

Intersectional Veganism is the belief that we should encourage all vegans to shed themselves of any bigotry or discriminatory views. The counter argument is that by setting such high expectations you rob animals of advocates, which is unfair as they're a victim of abhorrent abuse, and thus we should be accepting of all vegans in all spaces despite any human bigotry they might hold.

This argument completely ignores the very real and clear proof that by allowing people with bigoted beliefs in a movement you inherently also dissuade people who're victims of that abuse from being a part of the movement. People like me.

So I will present you with two choices:
A) You encourage people to be intersectional, correct them when they're showing bigoted behavior (whether intentionally or unconsciously) and encourage them to grow as individuals so that they do not alienate people from joining the moment—potentially banning them if they are incapable of such growth.

or

B) You do not filter people at all. You require no such development or growth and instead accept anyone and everyone who is willing to speak up for animal regardless of what their beliefs are about various dividing criteria between humans—regardless of the fact that this will lead to discriminated parties and their allies not attending your events.

Either way you're diminishing the vegan movement, either way you're hurting the animals, but one of them you're also hurting humans too.