Jesus fucking God, there may be nothing more insufferable than a smug Twitter pseudointellectual who doesn't even know what they're talking about.
The Vestals were not immured as sacrifices, but as capital punishment for breaking their vow of chastity, and
there are only ten recorded cases of this happening in the more than 1,000 years that the Order existed. The Romans largely abhorred human sacrifice and viewed it as a barbarian custom, though the gladiatorial games could count since they were originally held to honor of the spirits of the dead. Meanwhile, the lowest estimate for the number of sacrifices performed by the Aztecs is
4,000 per year. He would have at least had a point if he had mentioned bog bodies from northern Europe that show evidence of having been sacrificial victims, but I'd bet Alex hasn't even heard of those, and the number of victims is multiple orders of magnitude fewer than those sacrificed by the Aztecs.
As for the idea that infanticide for various reasons, including deformity, is unique to the West – well, India and China would like to have a word with you, dumbfuck.