It is funny, I have heard many people say they do not want Batman to get a Robin, who is apart of Batman lore, but they want Superman to have a son, which is not a part of Batman lore.
Superman having a son was one of the least popular elements of Superman Returns
, at least so far as opinion expressed online. You may have heard some people say that they liked it, but it certainly wouldn't constitute a majority opinion. Far from it.