I think you completely missed the point.
The problem is not that the sign exists, the problem is that people don't see nothing wrong with it.
If you were a Jew, how would you feel if you saw Nazi flags on a men's rights protest? Would you feel safe knowing that men a Nazi is safe around men? (Which probably means many of those men are nazis/nazi sympathizers themselves.).
That's how men feel when they see sexist messages in feminist protests go uncontested.
If they didn't vote in 2024, that's because they saw trump and said "yes, this is fine". If they didn't, they would've voted.
Even if they didn't like Kamala, they would've voted for her if they didn't think a trump presidency was acceptable.
Anything more positive for trump than "trump's presidency is not acceptable" means that America is not "better than this".