I don't think that can be construed as "mansplaining" Mr. Magoo is giving his opinion, albeit from a male perspective. If you don't agree with his opinion then that is fair enough (I am a woman btw)
I already posted on this thread and I agree with his and many other people's opinions on the OP thread. This is a symptom of other things. The OP has mentioned other issues too.
Yes, porn use can be a harmful addiction
Yes, some people see it as a deal breaker
Yes, the porn inducted is murky at best
Yes, some people see it as infidelity
Yes, some people would watch it in secret rat her than be judges by their partner (both male and female in my experience)
Yes, it is a triggering issue for some people
However, none of these are absolutes. You may feel extremely strongly about your opinion, and you are perfectly entitled too, but it doesn't give you the right to tell anyone else how they can or can't live their lives. It is for each couple to discuss how they I've in their partnership.
If porn is tolerated then thats OK if it's agreeable to both.
If porn is not tolerated then that's ok if it is agreeable to both.
A lot of MNers take no responsibility in their own part of marriage breakdown/porn use/infidelity, there can be a stong victim mentality here. BTW I am someone who has been through ALL THREE of those things. I am NOT saying that if your partner watches porn or is unfaithful it is your fault. What I am saying is that if people are unhappy in a relationship then in the majority of cases BOTH parties have some part in it (with the exceptions of DV or addiction) Dealing with this after my husbands affair (and other issues) was very very difficult for me, but many years later I can see I was not perfect and have learned from my past relationship a lot.
At the end of the day OP only you can examine your relationship. Only you and your partner can talk about this if that's the route you choose or you can leave if that's the route you choose. Either way I would think this warrants a frank and open conversation and perhaps counselling if conversation is too difficult without a third party present.
The judgment on these forums, especially towards men, can be very vicious. Sometimes you have to wonder why you have such strong feeling about something. What is unhealed in you can that resurfacing?