There's already people who think Nakamura is bisexual
I was a bit worried that this episode would confuse people and make them assume that Nakamura is bisexual instead of gay. I've already seen a few comments referring to him as bisexual.
The other assumption i've seen is that he is Hirose-sexual, so he is only attracted to Hirose. But if we look at the context clues, Nakamura never reflects on being attracted to a boy throughout the series and never shows attraction to any other female characters which presumably means that he'd already realised he was gay a long time ago before the series even started.
I think what's tripping people up is that they don't realise that the joke is completely centered around the ridiculousness of a gay character being confused by a woman purely because she's an exact copy of the boy he likes.
And if we take Nakamura's internal monolgue at the end into consideration, he concludes that he's not bisexual, he just subconsciously has a fetish for Hirose crossdressing.
There will still be people who misundestand it, but the main point is that Nakamura is still a gay character, he is not bisexual and the show itself confirms this.