system
Given the following post, respond as if you're commenting on Reddit:
human
[DCU/Marvel] What makes the citizens of the Marvel Universe so hateful to their supers, especially compared to the DCU?

Both universes contain their fair share of good and evil, along with a lot in-between. Yet, it seems as if the MU almost always hates super-powered individuals, no matter what they do in service for the regular joe. 

Meanwhile, over in the DCU, a vast majority of people adore and look up to their heroes. Sure, there is still discrimination and prejudice against them, but it seems comparatively tame.

So, is there an explanation for why each universe has a different general opinion on supers?
gpt
I'd say the presence of Superman himself.  

For a half century, he's been a strong symbol of powered beings.  He's represented "Truth, Justice, and the American Way" and reinforcing that *our* ideals are great enough that even a superpowered being would venerate them.  The citizens of the DC universe could always look to him and see an example of a good powered person that they understand and shares their values.  Some people dislike or fear Superman, but he's had a long time to win over the average person.

In the MCU, Cap was powered during WWII, but lost shortly after.  The average person never met him, only a small number of veterans and scientists.  The citizens had no experience with powered people for a long time.  When they suddenly started appearing in the 80s and 90s, it was already a scary time, and seen almost as a disease.  It was a time when the drug epidemics were growing, the AIDS epidemic was peaking, the internet was emerging.  Just as they saw AIDS as punishment for being gay or drug addiction as a weakness, they saw being a mutant as wrong or weird.  They saw it as a problem, not as a power.  The number of powered people in the MCU, not to mention alien invasions and gods. The world was changing too quickly for people to be comfortable with and they lashed back.