No it makes perfect sense, let me break it down for you.

nah, this is how vegan treat others

See, here he denies that this is how the religious treat people with "nah," offering up vegans as the "true" exhibitors of this behavior. Now to break down my response piece by piece.

Well "yes,"

He is correct, that is how ideological vegans, the ones who feel you should be vegan for moral reasons and as a result are very preachy and evangelistic, operate.

but "that is because to the ideological vegans, it is a religion,"

but the ideological vegans behave this way due to the fact that ideological veganism is tantamount to a religion

so not "nah" but "yes and-."

So, with this in mind, the "nah" isn't accurate, as both ideological vegans and the religious both act with the same vitriolic fervor due to them considering themselves morally superior to their respective "out" groups, so instead of

nah, this is how vegan treat others

It is

Yes (this is how the religious treat others), and this is how vegan treat others, as well.

To further explain the "yes and-" joke, Here is a youtube video from some random guy about the rules of improv. #2- "yes and-" is of particular import to this discussion, as it may be key to understanding the reference.

I hope that helped you understand my complex comment, no need to glitch about it.

(Just preemptively, to explain, see, "glitch" rhymes with "bitch," and so you see a pun was made in which you said I'm glitching and I said "no need to glitch about it," you see. I hope this one was not similarly misunderstood.)