The problem is that these things are set up to be unfalsifiable, and claiming that perhaps situation A or B was not in fact influenced by some hidden, systemic, nefarious thing like the patriarchy sets you up to be labeled at best ignorant and at worst sexist/racist/intolerant/etc. Simple explanations for cause and effect events in society are by definition suspect, if they cannot be tied to some larger scale societal struggle and narrative. It's basically a intellectual framework that has built up immunity from criticism via built-in argumentative tricks, similar to various forms of pseudo-science.

This is not to say there aren't plenty of places where discrimination happens and needs to be confronted. But it is not always the answer, and it is certainly not always the dominant factor in our day to day lives. Folks like the one you posted above seem to see everything in life through this lens, and it colors their opinions on everything, from the important to the mundane.

"Anyone can become angry -- that is easy. But to be angry with the right person, to the right degree, at the right time, for the right purpose, and in the right way -- this is not easy."- Aristotle

Search for "Offence trolling" and read that section please (the whole article in general is good, but that section talks specifically about what you are talking about).