You’ve heard this advice before but we can’t repeat it often enough. You are welcome to make casual friends; you are welcome to make friends casually, almost by happenstance.
But make enemies deliberately.
Make an enemy, or allow the person to go on thinking she is your enemy, only after careful deliberation. After careful, deliberate thought, after thinking through what happened and all that could happen.
Make or keep an enemy only after seeing clearly that having that person as your enemy will get you only your good, and will never and can never harm you, your career, those you love and serve, or your mission.
How likely is that?