AND IT CAME TO PASS AFTER THE DEATH OF ABRAHAM (AVRAHAM) THAT G-D BLESSED ISAAC (YITZCHAK)… [GENESIS/BREISHIT 25:11] Rashi comments: — He comforted him with the words of the formula of consolation which we offer to mourners (Sotah 14a). Another explanation is: Although the Holy One, blessed be He, had entrusted the blessings to Abraham to bless whomever he wished yet he (Abraham) feared to bless Isaac, because he foresaw that Esau (Eisav) would be born from him. He therefore said, “Let the Master of the blessings come himself and bless whomever it seems proper in his eyes” — G-d came and blessed him (Isaac)(Genesis Rabbah 61:6). Halacha demands we do not bless those similar to Esau (see Kitzur Shulchan Aruch 44:18).
It should be noted that it appears there are exceptional situations where blessing those similar to Esau seems to be allowed, as stated in Pirkei Avot “Rabbi Hanina, the vice-high priest said: pray for the welfare of the government, for were it not for the fear it inspires, every man would swallow his neighbor alive”.
Seek out guidance from a reliable Orthodox Rabbi when in doubt.