I don't get how a lewd scene with another woman in the bathroom is actually an option even if you don't watch it the mc is made aware of it by from what I have been reading?
I don't think people are being 'childish', 'dramatic' at all and as someone has already stated this CAN ruin the story progressing forward for many people as in their eyes this is just the same as being cucked (Man or women) as it's the MAIN LI in the game and considering she is actually on a date with the mc it really can be like a dagger to the heart for some people.
Being able to immerse yourself as the character in a VN is what makes them a lot better in my opinion and when something like this happens and breaks that immersion I can fully understand how it breaks that for them and myself.
I don't even think it's the fact it's with another women for many, Yes I don't personally find lesbianism arrousing so that is why this game isn't for me but I understand why people would be frustrated and I think people have a fair complaint to make.
But this is just my opinion and feel free to facepalm it all you want guys lol.