This is a straw-man - it seems like the author is just telling founders to classify critics as "haters", and ignore them. He has a parenthetical 'well, not all criticism is bad', but that seems there mostly to save face.

A lot of the criticism of startups coming out of the Valley, including YC (that they solve problems for the same small segment of society (Filld), or flippantly ignore technological or legal limits (Theranos, Zenefits)), is absolutely valid. I have yet to see this other mysterious form of "hating" materialize.