Definitely a mixed bag. The relationship itself was cute enough, but it did feature two pretty crappy tropes, those being the "lesbian sex doesn't count" and the "homophobes are just closeted" tropes.
Although it certainly is a cliché and a stereo type, as is often the case with these gross over generalizations, there is some truth beneath it. I can't say I've seen it much with women, but in my own personal experience I have seen quite a bit of the male variant of this stereo type of guys who are rabidly homophobic often having latent homosexual tendencies.
In my experience it often tends to be the individuals that come out of left field with it during seemingly innocuous situations and who make a big public fuss about it. It's almost like they are trying to shout out to the world "I'm not gay" when everyone else is just going about there usual activities with little or no trigger event apparent. I have known three people like this. Two acquaintances and one lifelong friend. The acquaintances I bumped into years later and they were out of the closet and the life long friend is now in his 40s, never dated and still rabidly homophobic and lets just say he really should take some precautions with erasing his browser history etc. if he is going to let others use his computer. I really do feel sorry for him, although that goes away pretty quickly once he starts ranting. He is also racist against Latinos and has the last name of Sanchez... Yeah.
I think no one said it doesn't exist IRL. Problem is,
as someone else pointed here, the idea was very poorly executed. Even within the LGBTQI+ community there are cases of gays and lesbians hating trans/enbie people, which is sad. Even bi people are often victims of hatred within their own community because they swing both ways, so they're portrayed as "unfaithful," or "cheaters."
I myself used to hide the fact I also like women, and even restrained myself from defending the flag, because of the bullying I had to put up with day by day back in school days. The fact that I studied in a Catholic school doesn't help, too, and for many years I lived in a self-denial scenario, but was dating women "behind the scenes." I indirectly contributed to the hating by not defending the LGBTQI+ cause and reminiscing silent whenever someone said shit.
However, the plot holes in this story are many, and the transition points also don't help, so any kind of misinterpration shown in the comments isn't the readers' fault in the slightest.