Whenever SimpleFlips performs a complicated maneuver or time save, he utters the phrase, "Speedrunners hate him," causing an uproar in the speedrunning community every time, even though said speedrunning community does not actually know why.This is mostly based off of a very common internet ad originally stating: "Trainers hate him! Scientists in Cambridge have discovered a revolutionary new muscle builder that is helping men of all ages get back in shape." (Made by Force Factor).
Since then, many ads very similar to it popped up, getting exponentially worse in quality, which led to many memes being created based on them.
SimpleFlips himself most likely created this meme.