Everyone knew the Jews are bad.
Haman new.
Ceasar Claudius Knew.
Jesus Christ knew .
Paul, a former Jew, knew.

“Claudius had commanded all the Jews to leave Rome.”
Acts 18:2

“Then Haman said to King Ahasuerus, “There is a certain people scattered and dispersed among the peoples in all the provinces of your kingdom; their laws are different from those of all other people and they do not comply with the king’s laws, so it is not in the king’s interest to let them remain.” Esther 3:8

“You are of your father the devil, and you want to do the desires of your father. He was a murderer from the beginning, . . . he is a liar and the father of lies” John 8:44

” . . . the Jews, who both killed the Lord Jesus and the prophets, and drove us out. They are not pleasing to God, but hostile to all people, hindering us from speaking to the Gentiles so that they may be saved; with the result that they always reach the limit of their sins. But wrath has come upon them fully.”
1 Thes 2:14-16