I'm familiar with the guidelines. Please explain to me what about this was uncivil so that I may do better in the future. Was it my choice in adjectives? Is "

I'm familiar with the guidelines. Please explain to me what about this was uncivil so that I may do better in the future. Was it my choice in adjectives? Is "stupid" not an appropriate word on HN? Is it because I had a spelling error? Is it because I displayed a strong negative opinion of something?