Why do people feel the need to shame other people's choices in order to validate their point?

I can understand it in some cases. Like.... People who oppose abortion often genuinely believe it is murder. If I believed babies were being murdered, I'd speak up, even if it was getting into someone else's business. And a lot of vegans genuinely believe animals are being treated with cruelty and abused (which is actually true with major production). But they think killing animals at all is heartless, so I understand them speaking up. But I'm VERY much so, "if you don't like it, don't do it" with such cases, and I myself try to buy from smaller producers with things like meat to avoid any unnecessary cruelty (I think the MEAT industry should be reformed, not necessarily people's diets to avoid cruelty). So I do get, to an extent, why they're loud with their protests. What I don't get is the common hatred and disrespect to those who disagree. Like... Screaming at someone, calling them names, belittling them, making them seem inferior... That's NOT going to get them on your side, so what's the point lol?

because they want everyone to be clones of them and don't like that others live different lifestyles

Because most people aren't able to see beyond their own egos, and aren't able to break free from the social status/pecking order competition shit their mind has been conditioned to accept since childbirth...

Why do vegos try and substitute meat with fake shit..
Hey everyone come round and try my T-bone fruit salad.. hmm yummo

I can only assume that their faith in their beliefs is fragile so feel the need to knock the opposition in order to feel validated.

Zero conflict = sterility

I'm not a vegan.vegie or a carnivore, I enjoy most foods, I am Religion Tolerant, I am not an Exercise Fanatic, But I do find the more some try to push their beliefs onto me, it turns me against them,
a couple of things I don't understand though, is why do the Activists target a small Butchers not a Halal Abattoir ? Why do Jehovah's Witness's have more doorstep Canvassers than any other Religion, why is it if Mohamed is revered so much is his name allowed to be passed down to people who can become Criminals, Scratching my head and pondering these questions

You do that kind of shlt too. The only way you blame people by blaming yourself as well. You do the same s*** like anyone does

Because everybody insists on being "right".