Don’t assume, especially emotions. You can’t read minds.
Speaking of emotions, don’t try to read it into someone’s post. Maybe the post the thing to make a point. Maybe they aren’t really angry.
You are not a mind reader.
Even if you think the words portray what the human who posted it is feeling you may still be completely wrong.
When in doubt, ask them what they meant by the post. Do not get upset without clarification. See rule number one.