"Speedrunning is as valid as x hobby" comes down to the same root as the "videogames are art" argument: Shame.
People dont want to look in the mirror and realize that yes, theyve been sinking years of their lives into videogames. Deep down, they know that time couldve been invested in more productive, satisfactory ways
So what's a good way to frame that? "Oh no, i'm not spending my checks on a product thats still mostly attributed to children and social rejects, i'm investing in art!" / "Me playing games 24/7 is the same as your other hobbies!"
While i can agree with some points for the "vidya=art" argument, i cannot be convinced the same way for speedrunning
And listen, ultimately everyone is free to do whatever they want, but getting flustered justifying yourself just makes you look more and more autistic
Side note: Anime girl layouts are how you know youre watching a degenerate. First of all, you are looking at the exact same thing your runner watches while stroking his cock, and second of all, anime is one of the first steps towards troondom