I don't see how this is fat shaming. While it's glorifying a certain kind of body, it doesn't seem to be putting it on a pedestal as the only kind of good body. Not that I'm trying to defend this trend in any manner, as I think it's ridiculous.
As for your point on porn, I don't know if you were talking about the entire industry in general, but if so, it does not need to go. Directors just need to stop treating their actors like shit.
There's about thirty million trends on the Internet that should be stopped. I believe we still have pro-anorexia sites up. Off topic but rape porn isn't specific to gender, it's entirely possible and even likely that women get off to it too. Don't just blame the men.
To me, and this is my own personal opinion which people will not like, it doesnt seem like fat shaming, it seems like more people trying to make more girls 'slutty', but that's just my opinion...Not trying to inspire hate, just sayin..Lots of stuff like this has been going around, like a thigh gap.
Its the fact that it creates these unhealthy bodily standards among young teens and children. No one NEEDS to be that skinny to be healthy. Beautiful at every size.