I've heard worse coming from my younger sister's lips and she's only 7. xD
Hmm... it depends, really. What kind of voice was the person saying the sentence in? If the voice tone was noticeably light-hearted, joking and warm - then it might've been just for laughs.
If the tone was deathly-serious, humourless and straightforward - then the person might have some serious anger issues. অথবা আপনি might've done something that really riled them up.
There are many things to consider....
How close the person is to you, whether they've ব্যক্ত similar things to আপনি before, whether they actually ever did any of those পূর্ববর্তি things, what their history of violence/crimes/behaviours is...
আপনি can confide in someone close to আপনি and then see what উপদেশ they can offer.
