Even tolerating others sexual differences seems like the wrong phrase to me. I tolerate the taxman stealing from me every month even though I want to metaphorically poke him in the eyes.
I don't tolerate my friends being man and wife, because what's to tolerate. It's quite acceptable and natural.
Equally I don't tolerate my friends being man and man, or wife and wife because it's not something that upsets me.
But yes I understand the point you are making, live and let live. Do whatever it is you like to do and leave others to do whatever they like to do B x
I use "tolerance" deliberately because it is the acceptance that people are different and do different things. There's plenty that doesn't float my sexual boat but I (largely) wave it on by.
We won't all agree on everything but if we can agree to be tolerant of those differences, we start out on the right foot.
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I do kinda agree with your comments about "bi-acceptance" as a term - it out to be implicit, rather than needing to be explicitly stated.
But. People are nob ends.