A greater error than pretending to hold a door open only to slam it against someone’s backside as they attempt to use it is the sin of failing to comment or interact with someone who has taken the time to respond to your post. It is tantamount to interrupting someone answering a question you’ve asked, giving the bird to someone who is waving at you, or hanging up on someone in mid-sentence after you called them.
Recap: If you start a conversation, finish it. It says ‘social media’ right there in the description, not ‘soliloquy.’
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P.S. Parenthetically Speaking 