I only listened to the first 30 seconds or so, but she's doing the 'calm' thing, the effectiveness of which cannot be overstated. That is actually a personal favorite tactic of mine to use in an argument when I want the person I'm arguing with to go from merely being angry to completely losing their shit.
Whatever crazy and probably inexcusable shit Gibson may say later on the tape, keep in mind this woman is purposely maneuvering him in that direction. Because I'm assuming she made the tape of the conversation, which makes the 'calm' thing all part of her plan.
Whole thing is academic anyway. Mel lost me with all his racist shenanigans of the past few years. Nothing he does now is going to move the needle in either direction. But it doesn't affect my enjoyment of the Lethal Weapon or Mad Max movies at all. The characters are always separate from the actors in my mind. I did make a decision when all the racist and anti-Semitic shit went down that I wouldn't be supporting any new movies of his from that point forward, but I'm still perfectly fine with the classics I grew up with.
I mean, what are you going to do? Actors are often odious people, and however bad they may start off, Hollywood usually manages to make them worse -- you just don't always know about their defects. If you want to boycott movies featuring terrible people, you're not going to be left with much to watch. Maybe some indie stuff and a couple documentaries.