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The phrasal verb “chill out” is a casual expression that means to relax. It’s generally neutral in tone, but it can sound a bit negative sometimes. For example:

A: What are you doing?

B: Nothing. I’m just chilling out in my apartment.

I don’t want to go out tonight. I’m tired, so I just want to chill out at home.

Stop worrying about the new job. It’ll be fine. You really need to learn to chill out.

A: I don’t want to eat Chinese food tonight!

B: Ok. Just chill out! We can order something else.

So, when using “chill out” to talk about ourselves, as in the first two examples, the tone is neutral. However, when using it directly to another person, as in the last two examples, it’s quite strong and not very polite. Therefore, please be careful when using this expression. If you use it directly to someone else, they could get angry with you.