Reupload confused me so bad, I was just like... huh, I recognize these characters - oh.
Anyway, I don't think the boi is horrible, but immediately outing 2 people to a bunch of other people and making them gossip, especially in a homophobic society, kinda sucks.
On the other hand, a world where you can say it and people accept it is nice. Riri wasn't going hide it and in the end nobody seemed to mind. People will always gossip about romance, for better or worse, and we don't know the context here... You certainly want people to respect your relationship, but saying, "no, I asked but she's going out with friend X" isn't in itself bad. Japan, like the US, is not one way or the other, and whether a school or class is going to be cool or not depends. I think Riri had a confidence in the situation, which in another manga might be naive but in this case maybe is good.
You can only be outed if you're in the closet. For better or worse.