The people of God are not the Magesterium.  The Magesterium is the bishops in union with the pope.   The Magesterium can, indeed, be wrong, and they have, indeed been wrong in the past.  It is a huge leap of logic to conclude from this that Catholic teaching on sexual ethnics and a whole host of other important issues needs to change, is in error or could change.  It is also a huge leap in logic to conclude that Church teaching should change because lay people, influenced by liberal, secular, humanist atheism think it should.

Church teaching is not determined by the whims and fads of pop-culture.  This is something liberal dissidents do not understand.  Church teaching is also not determined by the whims, fads and trends of Science.  What Scientist teach one day they change the next.  This is not to say that the people of God or Science has no role in determining Church teaching, only to say that it is not the final arbiter.