There is no joke, and there is no context. This person is hilariously obsessed with proving Linux is baaaaaaad, and has no problem with twisting the truth just to make their point

Splitting, also called binary thinking, black-and-white thinking, all-or-nothing thinking, or thinking in extremes, is the failure in a person's thinking to bring together the dichotomy of both perceived positive and negative qualities of something into a cohesive, realistic whole. It is a common defense mechanism, wherein the individual tends to think in extremes