Two things to note here, first that this isn't really different to any other part of the world. There's always some concern about feminisation of men by (usually) older people who had a rough childhood in the war or something and now project their ideals onto others.
The other thing to note, although its not particularly interesting, is that there's going to be a media bias against china from the west in general.
Hmm. Sudden off-topic thought: I regularly hear about the decline in violent crime, and hear it attributed to the end of leaded gasoline. Could it be due to falling sperm count instead (or due to the cause of the falling count)?
There are nuances and some culture differences in young people from asian and US background e.g. The feminine males are a big part in the mass media such as pop culture (Jpop or Kpop) and anime. Never have the muscular characters dominated any genre (just check any main guy in Japanese/Korean productions). The frail ones are a stereotypical archetype. But I guess you're right about the older generation projecting ideals onto youths nowadays...
The other thing to note, although its not particularly interesting, is that there's going to be a media bias against china from the west in general.