Understanding the difference between causes and triggers can help you take the other person’s actions less personally.
You can trigger a behavior, but that doesn’t mean that you caused it.
A trigger starts something that is primed to happen.
A cause is the reason for something to happen.
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Your neutral statement “what a beautiful day” might have triggered a negative retort “just leave me alone” because the other person was having a hard day. You didn’t cause their bad mood, you just triggered their snarling response. Don’t take it personally. Their response is telling you something about what is happening for them.