He's REALLY cautious on who his family members get with because he wants to preserve the "perfect" genetics his ancestors carefully mixed and bred to create the superhuman qualities he has
Not to the level like he's racist towards anyone his family members are in love with but it's something that he'll poke and prod them about so he knows for sure
Xander after realizing that his decades of swordsmanship and honing his skills + his family's centuries of the highly selective breeding of masters to create the perfect superhuman swordsman is powerless against an egg who REALLY believes in Jesus: