Maybe because media/information environments aren't the same as physical environments?
The word "environment" might be the root issue here. Using digital tools to connect with other people isn't the same thing as treating your digital tools as an "environment" that takes the place of the physical world. The former is very useful and can often be vital. The latter, I think, is where problems can occur.
If you've debated any dualists please share your notes, win or loss.
Dualists in what sense? Mind-body dualists?