One easy rule is that if someone says "Only talk to me about work." then the other person has to respect it. No forcing of social acceptance , no shaming the other to believe what you believe, just focus on what you were hired for. This is a standard taught to many managers to keep the company out of harassment issues , its very robotic unemotional but its clear and will allow different groups to work together as long as this rule is enforced.
Basically we should not have to worry about a toxic culture because you should not be forced into one when you work. You should just be able to work and separate yourself from your task in any emotional way.
[California dev, 8 years, have held manager position]