how do you tell your friends that jokes can hurt without hurting them?

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I have recently been offended by a friend's joke that she posted on my facebook wall so instead of answering to her post i just deleted it in my wall cause my boss might see it and the joke was about them. I had to make sure that nobody see's it cause both I and my friend works in that company and my boss might take the joke too seriously. My friend got mad and made stories about me and bragging that she is the good one to all our friends and making me look bad. I explained and told them how i feel but none listened and they made sure i feel bad. I don't understand how a damage control act can lead to this. I like my friends but if worst comes to worst i think i am ready to lose them, friendship is suppose to be fun, understanding and collaboration but seeing that it is leading to me losing my job, well, i don't know.