Are older siblings supposed to protect their younger siblings? Like... as in a natural instinct? Or do they naturally wanna bully the younger sibling? Why was/is my older brother so evil to me?

It's typical for siblings to protect each other from external pestering but torment each other privately.

Some people are good people. Some people aren’t.

It's a mixed bag even in "normal" families. When I was growing up everybody was bullied by their older siblings. Sometimes the oldest would be protective at school; usually not. Most grew up to tolerate their siblings. The rest of us can barely stand them.

After moving around I found there actually were families where the siblings are really tight in adulthood. But even then it was always preceded by blow ups as teenagers and lots of fighting as kids.

My older sister best the snot it of me... And anyone else who picked on me. I no longer speak at her.

As the eldest of three (with a 6 year gap between the second and 10 on the third) I think I was generally a good brother, but I was definitely still an idiot kid and accidentally hurt them several times while rough housing or just generally being stupid.

I would say I never intended harm on them, so it wasn't evil and if anyone picked on them is get very defensive so... I do think there is a natural instinct to protect but that doesn't prevent from accidentally hurting them yourself.

Hard to say though as kids and teens can be idiots and not think about potential consequences.

I'd be embarrased to post some of the things I accidentally did to my younger siblings, but a not so bad example is we were playing with sockem boppers and I upper cutted my brother into the corner of a door frame.

I got into a fist fight with my older sister when we were teens. Now we get along swimmingly. I don't really have a relationship with three other siblings that were further apart age-wise. Relationships are complicated and extremely so when it comes to people growing up as different stages of development will clash with others. That all being said, some people are just assholes and assholes can have siblings, too.

Speaking as a younger but also older sibling, it is definetly a mixed bag. While I never was 'bullied' or tormented to a point I'd personally consider it serious I definetly was the punching bag for my older sibling at times. Likewise my younger siblings were to me, although I can't really say nowadays why I'd ever acted that way towards them.

On the other hand, even while punching down, as the older sibling, during our childhoods we were always protective of our younger siblings when it came to outward 'threats'. It was like the older sibling was the only one to pick on the younger one. If someone else dared to try, it was up.

Nowadays as adults we tossed the 'bullying' aspect of the relationship aside completely. The protective part remains and grew stronger. Everyone protects anyone else, should the need arive.

I'm the oldest of three. I'm two years older than my sister, and three years older than my brother. We fought and argued a lot as kids, but we were always there for each other if someone outside of the family wanted to mess with one of us. As adults, we're really close. We get together every week for dinner, and have been playing Pathfinder weekly for nearly a decade now!

I am the eldest sibling, and in my own experience, my brother that I am closest in age to, we both fought and teased each other a bunch growing up. But we also have each other’s backs in a way we don’t have with our other siblings, since we grew up so closely together. I think the bickering was just a part of being kids and slowly maturing. I actually think having a sibling like that is an important part of learning how to resolve conflicts and be social.

My other siblings are much younger, so I was already a lot more mature when they came around. So I definitely wasn’t going to bully or beat up on them, and I certainly feel very protective of them. They’re all independent people who can take care of themselves, but if I see someone hurting them, you’d best believe that whoever is doing that will be getting an earful, at minimum. (Assuming that my sibling is okay with that, I don’t want to butt into something where they don’t want me involved)

I’m sorry to hear that your brother treated you so poorly. You didn’t deserve that, and he should have done better. I hope you have people in your life now who will stand up for you and protect you when you need it <3