Your argument is premised on this unreasonably general statement being an actual norm, which it clearly is not.
This general statement is far short of currently being a general norm.
But his argument stands if it is being pushed as a norm, with attempts to either formally enshrine this as a norm or policies that make it easier to enforce as a norm.
... and that just appears to be straightforwardly true in the university system. The quibbles are as to how effective and widespread such a push is.
> As Catharine Mackinnon, the progenitor of the school of feminism from which this movement proceeds, once put it, “Politically, I call it rape whenever a woman has sex and feels violated.”
Plenty of people feel violated after being dumped by a significant other, or feeling unsatisfied by entirely consensual sex (see the Aziz Ansari story). Even getting explicit, affirmative consent is no guarantee that the other party will feel violated.