When she asked him to join her in the shower shower and he said Nah, that should have been the end to it. The guy was tipsy and on the verge of passing out from the cocktails they had earlier.

But it wasn't the end of it. She took the rest of her shower to sulk in her insecurity and maybe her own frustrations about getting her period on this exotic vacation and the scene was being set for some kind of confrontation.

He did not say the "he wanted to give her space to sort out womanly shit" until much further in the conversation and it's clear that you have no interest in all the other problematic shit that took place up until that point.

He never said that he had a problem with the "physiological function" of a woman having a period. He simply communicated (in not the most ideal terms or tone as I have acknowledged) that he wasn't enthusiastic about joining her in the shower while she's on her menstrual cycle. You can try and womansplain a period (only woman understand it) or assuage the biological reality of menstrual cycle by referring to it as a physiological process (true but I can see what you're doing) or we can talk about period blood being biological waste just like urine, bowels, smegma, and not conflate people not wanting to interact with another person's human waste as that person not acknowledging another person's humanity.

If he does not want to join her in the shower because he's tired and tipsy OR because he doesn't feel comfortable with the thought of standing in bloody water OR simply because he just doesn't fucking feel like it, that should be OK.

You don't seem to acknowledge or even care about her narcissistic tone nor her hyperbolic sense of entitlement.

You don't seem to acknowledge her manipulative nature and her using the 'tampon whole swimming' trope as textbook gaslighting.

You don't seem to even acknowledge the guy's humanity or his right to have wants/needs/preferences irrespective to a woman's wants/needs/preferences

The brazen levels of cognitive dissonance in these comments is exhausting....😩😫