I feel though like the right-wing populists and alt-righters probably dont overlap much with the kind of people in support of killing net neutrality.
I'm not saying that they're the part of the Party pushing net neutrality, just that they're making the GOP even more toxic than it already was.
That said, /r/the_donald seems to be just as excited about killing Net Neutrality as the rest of the GOP.
Most alt-righters/populists our age are probably usually 4chan meme posters or others who already heavily use the internet.
Only group I can really see being in favor of killing net neutrality in the alt-right pool is like, your stereotypical tribal redneck who hates net neutrality because it was made by obama and they hate obama because he was black.
Not to be dismissive, but I think most alt-righters legitimately believe some level of "it was made by Obama, so it's bad," even if they won't say it outright. Alternatively, I think some people on the alt-right want it repealed pretty much just because it pisses off the libtards. Also, the right-wing populists aren't an Internet subculture - they make up a significant fraction of Annoying Orange's base.