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It's definitely not ruining YouTube... It may be ruining your feed, but that's on you.
Mediocrity is celebrated way too much these days >

"They keep creating new ways to celebrate mediocrity!" -Mr. Incredible >

I'm not a fan either, it's pretty annoying especially when most people reacting are horrible actors and it all just seems fake. I try to always find the original and like that video bc that's who deserves the likes >

it seems like almost every popular youtuber ends up as a react channel, I really like jshlatt but his "reacting to tik toks" videos are boring, but at least with him they are just some random effortless memes and not amazing videos that took long time to create >

Does this involve react youtubers? Honestly just view them the same unless it's a critique of someone reacting and picking parts of a show etc or just someone who is experienced in a real life scenario nitpicking things to inform his audience of what is reality and what is fiction.
Example: Lawyers React Is quite informational and entertaining than being summoned as a jury and watching a live court session >

Either I watch react content of things I watched and enjoyed or something I wouldn't have watched any other way and just enjoy the "reactor" >

Honestly anyone posting "reaction" videos is the least creative person I've ever seen.  Making money of stolen content. 
Baffles me people want to watch another person watch TV.