Homophobia in Haixing

If I were to write a Guardian fic the point of which was something completely unrelated to homophobia, but which ended with Shen Wei and Zhao Yunlan getting a happily ever after, what level of societal homophobia would not throw you out of the story? Would you find it jarring if they dared hold hands in public? If they dared kiss? If they introduced each other as romantic partners in casual-ish conversation without too much euphemism? Their nearest and dearest would know, and marriage wouldn't be on the table anyway, but ... what is the range of attitudes that wouldn't have the readership's suspension of disbelief come crashing down?

On the one hand, I want this to be happily-ever-after dancing on roses without a cloud in sight; on the other, a lot of the relationship developments of canon make more sense if Haixing is at least somewhat homophobic. So: advice?