There’s also the privilege of living in a location where vegan alternatives are readily and frequently available, vast swaths of the US are in what’s known as “food deserts”, locations where “residents’ access to affordable, healthy food options (especially fresh fruits and vegetables) is restricted or nonexistent due to the absence of grocery stores within convenient traveling distance” (https://foodispower.org/access-health/food-deserts/) these locations also tend to have high obesity or diabetes rates due to the fact that the only food easily and cheaply available is high in sugar. Add in things like the increased price for even simple vegan foods (like rice and beans) and you might be starting to see the picture, as much as some people would LIKE to be vegan it is literally not possible for them without either taking on substantial additional costs or completely upending their life.
A lot of the reason people who are otherwise pro-vegan (like myself) tend to dislike online vegans is that they will, consistently and smugly, while in a location and economic position where its easier to get vegan options, berate people for eating animal products without ever considering the possibility that its MUCH harder to get non-animal product based foods in certain areas
Food deserts aren’t just places where there aren’t grocery stores, they also include places where there are abundant stores but fruits, veggies, and other vegan or healthy options cost drastically more, for example, there are parts of New York City considered to be food deserts because all the healthy options are too expensive for someone on a low income to reliably afford, forcing them to go for unhealthy, but cheaper options. This is something that, to the credit of whoever is in charge of the NYC health department, the city has been working on solving, doing things such as incentivizing “Green Carts”, food carts with affordable healthy options like vegetables and fruits.
Also consider, you don’t know too much about that person’s life, maybe they live in a non-food desert location but have to travel frequently via car through food deserts, maybe they have to move a food desert in the future, maybe they have a dietary restriction preventing them from accessing several of those healthy vegan options, so they have to supplement their diet by using animal products.
Also, in my experience, most ‘anti-vegans’ tend to have no idea what a food desert is, the normal excuse is nutrients or iron intake, most of the non-vegans I’ve talked to that even know about food deserts have either tried to go vegan and found it too hard to do while also keeping up with their health and finances or work in an industry directly combating food deserts, just something to consider.