The vegan argument is lame.
It's not intended to be anything other. It's purely a comparison.

Claiming that if you contribute to the burning of fossil fuels,
You appear to be making assumptions. I never said this at all. We all contribute, there's no way not to. However, those who disrupt the general public with their protest, they are setting a higher moral bar for themselves.

Calling an environmental protester a hypocrite is fine. We're all hypocrites.
Saying it with ire or judgement is where it goes too far.
How the hell can you call someone a hypocrite without judging them?

...kind of talk that could probably get you a job at a major polluter's marketing team.
Yeah until I start talking about other things, like corruption. Not liking eco-twats isn't itself going to get me a job with these fuckers.