The leading theories for the biological underpinnings of same-sex attraction are also physical—some combination of genes, prenatal environment, and biochemistry—so this argument fails both ways.

It’s moot in any case because the whole point is identifying groups of people who benefit from help tailored at their situation so it’d make sense to specialize even if it was a choice. If we saw tons football fans more likely to contemplate suicide after the Super Bowl we’d want to support them even though that’s unambiguously social. Helping people is what makes civilization worth having.