You need a little education in the definitions
of'Nazarene' and 'Nazarite.'
A Nazarene is someone who was born or
raised in Nazareth.
A Nazarite is someone who has taken a vow
before God for a certain period of time, to
encourage them to become humble and
submissive to the Lord.
Neither term therefore has anything to do
with the kind of slander you are trying to
bring against Israelites generally.
Lactose intolerance might have to do with
the admixture of race, but that does mean
it is the exclusive malady of 'bad' Jews.
Solomon, king of Israel, made many marriages
with daughters of foreign kings. None of his
descendants would be what you consider 'pure'.
Neither are you.
Non-Biblical sources have no blessing on them
to be accurate. I can probably raise 50 people
who would say that we didn't land on the moon,
who are simply technically-adept idiots.