As someone who has done keto in the past and someone who has been a vegan for years I agree, at least in regards to myself. But the key difference is veganism is not a diet, what vegans eat is just a consequence of their ethics. Vegans are insufferable because animal ethics are a serious moral issue. I disagree with the pompous part though. I don't pat myself on the back for being vegan the same way I don't pat myself on the back for not committing various other moral abuses. I'm not contributing anything positive to the world by being a vegan, but I'm hopefully stepping on the rights of others less.
It's because it isn't about diet. It's a moral problem and those that reduce it to diet are purposefully avoiding the uncomfortable reality of finding one's self on the wrong side.
When I am cutting on a LCHF diet I’ll sometimes take food with me to gathering so that I can remain focused. So, I’m not drinking, I’m staying well under 30g of sugar per day and I’m super focused on that and want to maintain a streak.
Friends have become majorly hetup with me for refusing their famous carbonara or something and eating from my lunch box.
Now, I understand how “weird” that is and I’ll take that but it’s not rude to decide what goes into my body. Check yourself.