I felt like I could delete the response but something just held me back

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It has been sometime since I wrote down a certain discussion and got quite a number of responses but I got one response that was out of topic and flatly rude.But the I thought about a few things raising questions why we read and even go ahead and give an opinion of what we think.Do we give a response based on the title yet it has limitations to give the entire meaning of the article?Then if you read the attached article,do you give a response based on your understanding of what is written?Or do you just do shallow reading without understanding anything and give a response of what abruptly comes to your mind? So from my personal formulated questions,I guessed this person may be fell under the shallow readers and I decided to let it pass and even leave the response as it was.