I'm trying to be charitable and not over-interpret the juxtaposition of "LGBT" and "lower achievers". I'm surprised you have so much time to study who is having sex. Quite remarkable.
And there's definitely evidence that lower academic investment is correlated with higher sexual activity; I've been up for dozens of hours now so forgive me for not throwing some papers in your direction, but they shouldn't be hard to find.
I don't think it's healthy for anyone to really analyze this stuff for any demographic, but acting like what he said was so awful was really out of line, and pretty clearly breaking HN's guidelines.
Also rainbow, but I don't quite see that. The straight kids are already thrown together in all kinds of ways and for the most part know that each other are straight. On top of that, there's the issue of numbers. If there are, say, 20 out gay kids of a given gender in a high school, it's quite likely that there are no mutual attractions between any of them.
Honestly, I think the bigger reason is that there's no chance of pregnancy in gay relationships, so one big barrier is just gone.
I guess you just need to write assertively and nobody will question it.