[0] https://www.thedailybeast.com/vegan-youtube-is-imploding-as-...
Same reaction would occur for any vocal activist caught doing the antithesis of what they preach.
So, if a person has honestly tried everything and they absolutely need to eat some meat and fish to be healthy, then most won't have an issue with it. There will always be crazy internet kooks though.
I have met far more people who tell me cliches about vegans than I have vegans who tell me they're vegan.
Whether it's confusing or not or obvious or not, it was an extremely common term in the online vegetarian community I used to participate in around 15 years ago. Not trying to make a judgement on the term, just informing.
"Hackers" have their own version - *nix.