Discord is not social media. It is a chat app, one that has lots of channels and features. Social media is something ANYONE can join and take part in. But people like to pretend Discord is social media, or a suitable replacement for a forum, which it absolutely is not. The "privatization"/silo-ization of knowledge via Discord servers causes great harm on the wider Internet, and it sucks, and I wish more people would talk about that.
If you don't like social media, you don't have to use it. But Kids These Days love social media because it is someplace they can socialize with others, for free. The reason why kids don't go outside and play with their friends until dark or hop on their bike and go to the park or something is because you built the suburbs, where everything is so far you need a car. There is no public transit, and even when you find a place to hang out, you need money. And even THEN you cannot stay there all day. Social media and the Internet in general is the only place most young people (and, lets be honest, older people) can hang out with other people without being pressured to spend money.
As a queer person, social media was a lifesaver. Since I didn't fit the stereotypical (and very false) idea I had of what a gay person or trans person was, I assumed I was cishet, and I just hated myself for normal reasons people hate themselves. There were no queer characters in the books we had to read, there was no queer history, there was no queer club. Because of the lack of public transit, there was no way I could go to meetings or community centers to learn more (assuming my parents would even let me, which they wouldn't). I really got my hands on the Internet when I was in college, but that was mostly Facebook. It was only after college, when I was on tumblr where people were much more open and diverse about their gender and sexualities, did I figure all of that out, and only then could I start living my life.
For people who have no problem finding "community" because they are already the majority, cool, I'm glad you feel like you don't need social media or online communities in general. Not everyone has that luxury. Not everyone can safely express who they are or learn things in the real world.