You're the only one arguing whether the Jor-El shyt should have an impact on the success of the movie or not
I haven't seen anybody claim that this will hurt the movie. Only that it hurts the lore, and that it dilutes the championing of immigrants which Superman originally, and according to Gunn in this movie, stands for.
For me, I still love this movie - I just dislike that aspect. Again I'm seeing it for the third time tomorrow, so just like me I don't expect this to be a showstopper.
I think I saw BvS like 6 times in the cinema, even if there were parts of it which I disliked - I spent my money on it over and over, and still doing it as I copped the 4k recently.