They actually largely came about because people protested and demanded to be heard.
Ignoring that your statements are optimistic at best. Some gay people are accepted into mainstream society. Anti-war activists absolutely have recently still been considered terrorists. Hell, anti-RACISM activists are actively being called terrorists by the government right now which goes to the next thing, which is that segregation as a legal concept has ended but turning neighbourhoods white is still absolutely a thing.
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Now in 2020s Gay people are accepted in the mainstream society.
> The 70s when mainstream american society treated anti-war activists as terrorists?
Anti-war activists are no longer treated as terrorists.
> The 50s and 60s when white people literally moved out of cities and into suburbs to get away from black people?
Segregation has ended.
All of these positive changes have come by "You surrounded yourself with lots of different people with varying opinions."
If the people were so rigid with their views as assume them to be then these positive changes would have never happened.