Because the implication of their argument is
biological causation, which is pure conjecture on their part.
On the other hand, the entire posted article goes at length to study the social impact of social media for young people and young girls in particular and routinely references the heightened effect of the hyper focus on bodies for young girls.
Their comment is just a naked assertion. Would people find it offensive? Well, if the entire basis for your point is a strawman, then yes. But as far as I can tell, there is no causal evidence between femaleness and social media addiction or suicidal ideation. The need to leap to biological causation is unwarranted and unsupported.
Acting like they're already agrieved is a rhetorical slight of hand without substance.