Yes. That is true. And also. Japan os not the friendliest country towards the lgbt+ community. And do have a lot of pervs. So it's not that weird for her friend to be worried. Even more so when they are teenagers and he's an adult. It's true her friend overreacted but I hope she will get to know him and let go of her prejudices.
I get that, but I would worry as well, but I wouldn't pull a full narrow-minded Sherlock and start digging up on this person. I would simply tell them to be careful and if anything happens they should come talk about it, maybe even ask of I can join them to hang out. But that's it, bc we don't have a place to button into other's lives like that, her friend didn't ask to have Shinobu background checked like this. And I hope you'll take responsibility if this girl goes as far as to belittle or discernment against them as well.
If she does discriminate though I don't think she will. That ain't the point of this manga. I will feel disappointed af but why should I take responsibility for that if I may ask. It isn't me who is discriminating but just saying not to judge her so hard when to some degree her worry is understandable. Is what she's doing severe kinda. But I think it's ment more as comic relief as this detective work jig is common in all sorts of manga to all sorts of characters. But nonetheless I was simply stating my opinion as are you.
To all of ya calling her out, take this into consideration.I think it's less the looks and the fact that he's an okama and more so the fact that she thinks it's just a man trying to take advantage of a naive girl. I mean she has reason to doubt... Our girls as naive as they get. She knows nothing about the man apart from the fact that he took her out to get her clothes and make up. Tbh if my friend told me I'd think bad option first then okay normal person route. She's just worried about her. I can't blame her. But that's just my opinion as a worrywart. To clarify I adore our little cinnamon bun and I hope this whole misunderstanding gets resolved quickly.