it is totally natural to assert yourself at the detriment of others, but I am not sure if it is OK to do it by force without using rational arguments.
People do it all the time; you only have to look at some of the anti-vaxxer threads on here to see people starting from an emotion-derived conclusion and then attempting to prop it up with logic. But it's not just them, of course, I'm sure we all do this sometimes, to some extent.
Funny you started to talk about this. Two different opinions, but I hope that respect or at least tolerance for other's action are on both sides... But it is off topic here.
There's no single answer, because the root cause will differ from person to person. You'd have to unpack someone's whole identity to understand why they feel a certain way about something.
Of course. But here I would like to go back to my original questions - I am observing some level of dogmatic view to matters related to sex across whole society. So maybe it is not so individual as it can be seemed?