Just for some background: The gentleman is engaging in a reversed form of appeal to consensus here; perhaps there’s another name for this particular sort of logical fallacy, I don’t recall.
There was a senate Candidate in 2012, if memory serves, in Indiana, and another one in Missouri. Both of them, fundamentalist Christians, espoused a supposed “scientific” notion, circulated only in their churches, that during rape, the fight-or-flight mechanism is so stimulated that pregnancy is impossible. Of course, the utility of this myth is to enable the anti-abortion Christian to oppose abortion in the case of rape and incest, on the grounds that neither is possible.
Everyone who is not a fundamentalist Christian, and the majority of americans who are, declared these two individuals stark, raving mad; their candidacies subsequently went up in flames.
The gentleman, by using the term “they”, is attempting to argue that americans believe that nonsense in large numbers. It’s intellectually dishonest of him to argue thusly.
Hope that helps.