How do I salvage my reputation?

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One night I was posting in a Facebook group asking for regulations about posting. Unexpectedly, the people thought I was being dumb and told me the title of the group was self explanatory. The conversation escalated to involving a great portion of the group. I think I came off as stupid and annoying and that worries me...

I don't mind that too much as it will probably eventually blow over as few people know who I am on fb. But I'm worried about how it might affect me IRL as some people do know my identity. I'm especially worried my mentor-friend will drop me when he finds out about the post...

I tries to delete the post but the people in the group told me not to or else I'd be in trouble.

What do I do now? I'm most worried about my reputation and my relationship with my mentor/friend...