What is ok and not ok to chat about.

I know, I might be in the wrong place, but I had no idea that certain subjects are not ok to chat about in public. Which leaves me with this question: - Why is it ok for some shit at work to have a 45 minute chat about her shit lemon drink. - Yet, apparently it's not ok to chat about a sex dungeon where I r^ ^e and m^^^^^r women? There's no difference in conversation. It's just a conversation, you can tell someone to not chat about that, that's fine. But why is that a sackable offense?
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