Wow, this is really sad. You were speaking the truth about your trauma and then bashed for it. Only my step-mom reads my writing, in my family. My words might hurt others because they wouldn't want to read about what they actually did to me and how it made me feel. Your family didn't want to face the truth in a serious way, it seems and I am sorry for that.
I am glad you've spoken up and written about it to heal, it really is healing.
I've used laughter to gloss over some pretty traumatic shit while talking to my brothers but this makes me think we need some serious conversations!