I even mentioned that I have the The luxury of being able to sacrifice my relationship with my family to stand up for what I find to be morally correct. I'm also fortunate enough that I don't have to sacrifice my family relationships to stand on the side of morality. The idea I'm trying to get at is that at some point what's right is more important than what's convenient. And I'd then argue, only children are afraid of being punished for doing what's right.
Ditto for my ex-SO who we've disagreed with about a few things. If you talk to someone with respect, and compassion with the goal of understanding over proving you're right. It's very easy to disagree harmoniously. But again, that's a matter of respect and tact. Not about separating who you appear to be from what you actually believe.
I'm hard pressed to think of a more toxic relationship with someone you'd call your significant other than one where you have to pretend to be or pretend believe something fake just to avoid something that may be uncomfortable. If you're speaking from experience; I don't envy you. That sounds like a horrible way to live your life. Avoiding conversations because of fear of conversations that require tact. If that really is you, you have a lot of learning about how to have conversations to make up for.