100 Percent Correct!
THE REAL CULPRIT in all of this, would be the very much "OUT DATED" ideas of; self centered conformity, intolerance and ignorance, which are the very same poisons that don't allow for true progressive growth and diversity to flourish and for societies to naturally evolve, if those looks, attitudes and philosophies DO-NOT conform and adhere to what their ideas of Cool and Hip acceptability are.
The problem never was Superman’s classic costume with the attached belt trunks or, Superman himself for that matter (although, Superman is used, wrongly as scapegoat of convenience, as it difficult to admit to certain problems)
The Superman Red Trunks Syndrome SRTS!
This whole debate would make a tremendous study on peoples perceptions and misconceptions and, why they think things are (thought to be), but are really not, as you have a deep polarization of peoples feelings-philosophies one way or, the other :
Then it would be time to re-boot the franchise (I'd imagine) but, with the multi-verse in play it really opens up a variety options one where Superman is not married, one where he is married (Lois or Diana or whom ever) etc...