Anyone who gets angry about you bringing up something instead of having an adult discussion about the possible options to keeping a healthy relationship is someone who is afraid that you will take something away from them. This type of behavior is often seen in alcoholics who think that anything you say about their alcohol might change what they like doing with it.
Granted, I don't personally have an issue with porn. But I don't live your life and whatever your boundaries are regarding it is what you need to have someone else respect. To me, if a thing replaces the majority of someone's interaction with a human being, it is a problem.
Things can be...alcohol, gambling, porn, gaming- anything that lets the person zone out, indulge in their selfish world alone and ignore other people, mainly their significant other and just focus on their selfish needs.
Granted, once in a great while I might want to 'get off' quick or something and not involve someone else, and I might utilize porn, but it's in no way shape or form a replacement for real life and a real relationship and having real sex with someone.
Problem with addicts of any kind is that they don't see the selfishness in what they do and they often do not realize that their behaviors are avoidant and immature among other things.
Respect yourself, hold your boundaries and allow yourself to be with someone who understands and respects you 100%. You do not deserve 50%, 80% or some other level of respect unless YOU lower your standards to that. Kick him to the curb and he can jerk off there all he wants- alone.