Actually thats completely false, human populations that have a higher percentage of neanderthal DNA will differ in behavior from those that don't. This is very obvious, and claiming otherwise is intellectually dishonest
Once again, no evidence. Just stating it’s true and obvious.
But let’s test it. Are you referring to people like say Papua New Guineans who have very large amounts of Neanderthal (4%) and (6%) Denisovan dna ? Or are you maybe talking about Europeans which have less (1 - 2%)? Also can you tell us the exact behavioral differences that are so obvious from people with less than 2% Neanderthal dna?