I might have agreed, but for two things:
1. We're in a post Ant-Man & The Wasp world. The MCU has released a movie I hate more then Batman v Superman once now, so anything is possible. I still default to being excited for MCU films, but my excitement is tempered by the fact that they have the potential to completely fail.
2. I HATE 60s shit, especially stories focused on characters being shitty in the way 60s people were. Even Doctor Who got weird and did this shit fairly recently, in a roundabout way (the 1st Doctor became much, much more sexiest then he actually ever was when a recast first Doctor teamed up with the last Doctor, but because the show started in the 60s that meant that the ancient alien from a world that obviously had gender equality millions of years before he was born had to act like a shitty old man from 1963, even though he rarely if ever acted like that in the actual 60s). If Reed richards acts like that, then the entire FF franchise is fucking done. You think Fant4stic killed the franchise? Try seeing what happens to people's interest if 3 of the four characters in the FF are shitty to women "because 60s". Its a great way to make people absolutely loathe your "heroes". We don't need to see Reed Richards (or Ben/Johnny) by way of Madmen. We don't need to see the 60s attitude toward women in a superhero movie made in 2019.
If they could guarenteed that none of the social shit of the 60s would come into play, I might grudgingly accept a sixties setting, especially if we got some cameos by characters who were around at the time. But, it would most likely be like the Agent Carter tv show (I dropped that crap show because it was basically nothing but "Look how shitty people are to women in the 50s", and had little to no plot besides that), but worse because it would take down a well known Marvel property with it.
There are many places where exploring the shitty parts of our history makes sense, and its probably important to do that. The MCU is not that setting.