I don't see that conditional made in his claim. I'm asking for data to support his claim, if such data does not exist than it indicates the claim is unlikely to be valid.

Would you like to clarify your meaning of "normal porn" and "toxic porn", and what data exists to support your claim?

As with any social or morality based topic, people drift back and forth between wide and narrow scopes. People tend to use the most extreme and narrow scope to establish a point, and then casually shift to create the impression of that point applying to the wider scope.

Most of this thread boils down to "partial-birth abortion as an argument against the RU486 abortion pill" level reasoning.