Once again, you are caught making up stuff that is not in the Word of God. No where in the Old Testament or Tanakh will you find a law forbidding a contact with Gentiles, or that Gentiles are unclean. The ORAL LAW (now can be one of four Talmud which are extra biblical teachings) was what Peter had to UNLEARN. Christians today can learn from many of the incidents with Pharisees and other religions of Christ's day that Christ himself railed against because they were not of God or of the Word and was TRADITION AND DOCTRINE OF MEN.
What you will find in the OT/Tanakh is a person who has leprosy is unclean. A person coming in contact with a dead person or a dead animal is unclean. A woman during and for a time period after her monthly cycle was unclean. But, the good news was none of these defilements of uncleanness were permanent.
Also you will find prophesied that when Jesus came and performed His ministry, that he healed the leprous, gave sight to the blind and hearing to the deaf, cast out demons, healed all manners of illness and raised the dead back to life. And this was all done in the area of Judea and Jerusalem where the majority of residences where Jews. And those non-Jews, those tax collectors and other sinners, well he hung with them and guess who called him a sinner for associating with sinners? Those self-righteous Pharisees.
Peter should have learned 10 years earlier about associating with Gentiles, but his behaviour went unchecked until that one fateful day in a vision he was shown not to call what God called common as being unclean.
If we learn and unlearn anything from these teachings, let us walk as Jesus walked and put aside any prejudices.
To add to this, proof gentiles were not dirty and shold not be discriminated against:
Leviticus 19:34, "The stranger living with you must be treated as one of your native-born, and you shall love him as yourself; for you were strangers in the land of Egypt. I am Yahweh."
Numbers 15:15-16, "One ordinance shall be for you of the congregation, and for the stranger who sojourns with you, as an ordinance forever throughout your generations. As you are, so shall the stranger be in front of Yahweh. One Law and one manner shall be for you and for the stranger who asojourns with you."
Exodus 12:48-49, "And when a stranger lives among you and wants to sacrifice the Passover to Yahweh, let all his males be circumcised, and then let him come near, and sacrifice it; and he shall be as a native of the land. But no uncircumcised person shall eat of it. One Law shall be for the nativeborn and for the stranger who dwells among you."
Isayah 56:1-7, "This is what Yahweh says: Keep the judgments, and do justly; for My salvation is near, soon, to come, and My righteousness to be revealed. Blessed is the man who does this, and the son of man who lays hold on it; who keeps the Sabbaths without polluting; defiling, them; and keeps his hand from doing any evil. Do not let the son of the Gentile, who has joined himself to Yahweh, speak, saying; Yahweh has utterly separated me from His people. Nor let the eunuch say; Behold, I am a dry tree. For this is what Yahweh says: To the eunuchs who keep My Sabbaths, and choose those things which please Me, and hold fast to My covenant: I will give to them, in My House, even within My walls, a place and a Name equal to that of sons and of daughters; I will give them the Name of The Everlasting: YAHWEH; which will not be cut off. Also the sons of the Gentile who join themselves to Yahweh, to serve Him, and to love the Name of Yahweh, to be His servants--everyone who keeps the Sabbaths without polluting; defiling, them and who holds fast to My covenant--I will bring them to My holy mountain, and make them joyful in My House of prayer..."