Civility 
Regarding edits such as this: Please do not make personal attacks on other people. Wikipedia has a policy against personal attacks. In some cases, users who engage in personal attacks may be blocked from editing by admins or banned by the arbitration committee. Comment on content, not on other contributors or people. Please resolve disputes appropriately. Thank you.   
You shouldn't just be thinking about that, but also WP:CIVIL. Every comment you made towords this user was sarcastic, belittling, or otherwise uncivil, and therefore unacceptable.  
accusing him of "acting childish", mocking his grammer, and saying things like "nice contradiction" are all uncivil comments, regardless of how he acted.  
You're attacking him as a person as well as being abusive in response to him; I think the tag is appropriate.  
See the links I provided two comments up. You've been completely disrespectful to this user through all of your interactions with him.  
I'm saying that your comments in the diffs I provided were incivil no matter how you look at it.  
You're certainly free to disagree, but know that further conduct along those lines will not be tolerated.