It is all about boundaries. I learned this in marriage counseling. Like if she degrades him on facebook again he should go piss on her laptop. Sends a strong simple message, and most importantly from a relationship standpoint establishes a firm set boundary. He just hasn't set the proper boundaries.
I'm personally a strong believer in the "hatred will only lead to more hatred". Strong responses will only lead to stronger responses until everything break. If you've reached that point, You're better off going your separate way before both of you lose everything you cherish.
Now that's just my personal opinion, but I've seen that kind of thing happen.
The "make your point" strategy will work once or twice, IF you take the time to sit down and clearly explain WHY you did this and both of you come to an agreement and understanding. But realistically speaking, if someone pissed on my laptop, you can be sure your hotdog would finish in literal "*your* hot-dog" no matter if the previous act was justified or not.
Also, remind me to never piss you off