Some online vegans especially on lemmy act like it’s all or nothing, well then these people will never even try eating less animal products.
That is because vegan as a concept is all or nothing. Promoting the eating of less meat and animal products would be something else.
Honestly a great way to get people to decrease meat consumption is to promote more meatless dishes. Not replacement meat, but just dishes that are their own plant based things doing their own thing. Like promoting bean based chili instead of meat based, or grilled vegetables as the main course. Trying to sell someone on grilled mushrooms for example is actually pretty clever until it is promoted as a 'meat substitute' where it will be compared to meat and that will count against it.
I'm an omnivore, but some solid options from Southeast Asia that aren't pretending to be meat alternatives and are just good on their own will fill me up and I'll eat less meat.