Romans 12:9 is (as with many items in Paul’s letters incorporated into the Bible) somewhat at odds with many things Jesus himself said in the Gospels themselves. Of course, you shouldn’t go hang out with the Crew of Evil, yet Jesus also tells us to not hate our fellow sinners.
Also, it wasn’t just the Pharisees getting a size 12 sandal shoved where the sun don’t shine in the Old Testament. There’s a reason Moses had to lead them out of slavery.
Fun and unrelated fact: There’s an account in the Bible of what appears to be biological warfare.