What are good reasons to be hostile with someone being friendly with you?

What are good reasons to be hostile with someone being friendly with you?
I mostly do it both as a precaution towards people I don't trust and as a power dynamic.
Sometimes I just prefer to answer with over-the-top obviously fake friendliness, with some "friendly" threats and insults as jokes.
Always love to see how uncomfortable they get, but if they stand up I might respect them.
What about you?
Updates:
1 mo
My reasoning is that is better to prevent rather than cure.
No one can plot or hurt you if you plot and hurt first, right?
What are good reasons to be hostile with someone being friendly with you?
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