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It is obvious by reading your account of the event that happen that you are a very well respected artist who cares about your work and others that are in this field. In terms of what happen, best to let it go without saying much more as this event seems to have been forgotten. Instead of trying to say sorry for something that was posted, continue to be positive in your posts like you have been doing as your followers will appreciate your writings and thoughts on artists.
I hope that this information was found useful as please inform me of any additional questions/concerns you have. Also if you could take a second to rate my assistance so that I know my help was found useful today.