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Cats are better than a lot of people. Not all the time, there are still some decent people around. 
I don't ever see a cat and think, oh you've made my day worse. I do think that after seeing some people, or reading whatever hateful crap they've written. Then I go back to the cats.
The impact on mental health alone is insane. After doom scrolling I feel horrible about myself. It’s an onslaught of reading people argue over nothing, comparing myself to photoshopped women, feeling jealous that I don’t get to fuck around and travel, etc. It’s inescapable online. People are the worst version of themselves on the internet. 
The shitty thing is, I’ve tried to get rid of all social media but it makes me feel like a hermit when I do. I’m so conditioned to immediately go on my phone when I’m bored. >

I'm 30 and just got rid of everything in October except BeReal and Snapchat, as lame as that sounds. I like Snapchat because I can still keep in touch with people, post the things I want, and only check the stories I want. No other bullshit, long text posts, arguing, so on. BeReal is fun because it's new, and it's just a once a day prompt to post what I am doing right at the exact moment the notification goes off. 
Everything else was beginning to be exactly how you described it for me. It was just non-stop toxic trash. No more Facebook, Twitter, or Instagram for me. I'm actually MUCH happier without them. You'll feel like a hermit but your mental health will thank you for dwindling down your connections to only those who truly want to connect with you, and not the filler garbage of everything else.
ETA- yeah, I didn't get rid of Reddit, because I don't use this like social media, nor does it feel that way to me. It's not a toxic space like the "big 3" are (FB, Insta, Twitter). Getting rid of things for me was getting rid of those 3 mainstream social media apps. Here I most times just see lots of memes and cat pics-its a happy space, not a toxic one like the others are. Sometimes I chime in on things on Reddit, but it's not very often, and admittedly, sometimes it's hard to fight the nature of being human and wanting to have something to say. Personal growth is a journey, and not a perfect one! So if you're out there looking to put yourself in a better headspace- don't give up, keep pushing on, and do what is best for you! >

I really quite like Reddit. It has a bad rep, but here I get to see strangers genuinely be happy, random cat pics, fun trivia and memes, and even some good life tips.
It’s the only social media(if it can even be called that) I’m active on >

This site is the only social media I bother with too because I like the anonymity of it. The stupid shit that gets posted on sites like Twitter and Facebook I can see on here as people will post it on certain subs. People are generally respectful here, obviously there are exceptions because trolls exist but on the whole I find reddit to be much more suited to how I want to interact online than the other available sites.
Also, as you pointed out, there are cat pics here. Enough cat pics to keep all of us cat lovers happy for as long as we wish to look at them. I don't know how many cat subs there are on here, I think the number is pretty high, it's never too many though, that's impossible. >

Never too many cat subreddits, lol. I think I follow 12 myself that are strictly cat related, and always finding new ones.