People are absoutely right here saying 'facts are facts' no matter who utters them, and examples from science are good ones.
Another way of looking at it is as an extreme version of the whole Piers Morgan argument -- I forget which particular activist it was that he took issue with, but when the initial reaction was akin to, 'Piers Morgan disagrees with this person, surely you don't want to be on the same side as Piers Morgan', others then pointed out that, actually, you could look at it like this: when someone is so extreme that even Piers Morgan calls them out, surely something is amiss.
i.e. in this case -- TRAs, if your pro-authoritarian, anti-autonomy, sexist and homophobic ideology has reached the point where even Vladmir Putin thinks it is a bad idea, it's really time to start re-examining your life choices.