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What is the genesis for this claim that Catholics, or any gentiles, shouldn't hate those who publically and/or privately identify as Jews?

It would seem that this hatred, which does exist towards Jews, would be covered under righteous hatred.

Jews who are in the process of undergoing sincere conversions would be the exception.

If someone should kill the beloved son of a man, and then stretch forth their hands still stained with blood to the afflicted father, asking for fellowship, would not the blood of his son, visible on the hand of his murderer, provoke him to just anger instead? And such are the prayers of the Jews, for when they stretch forth their hands in prayer, they only remind God-the-Father of their sin against His Son. And at every stretching-forth of their hands, they only make it obvious that they are stained with the blood of Christ. For they who persevere in their blindness inherit the blood-guilt of their fathers; for they cried out: "His blood be upon us, and upon our children" (Matthew xxvii.25). ~ St. Basil the Great