He called me an "a**hole"?

[Maria]

So I was on twitter talking to a guy friend and we were just going back and forth and he said "Tushe..." as in "tushay" after I said something back to him and so I tweeted him back and said "I never knew how to spell that word till today thanks " then he said "lol neither did i, i had to look it up" and i thought we were being playful and kidding around so i tweeted back saying "Lol what did you look up? 'how to roperly spell tushay to make me sound smart'?? lol" and i guess he got offended because he tweeted back saying "Lol no a**hole i just looked up tushay."

I did not mean to be mean or sound rude i was just kidding around. Im a girl and growing up with 2 brothers i was taught that a guy should never ht or use fowl language towards a woman. I think my comment made him mad. I tweeted back sayng "....lol your mad" again kidding around, to see if he would disagree, and instead he just retweeted the tweet.....

I was so embarassed by his insult that i deleted all the tweets i had in conversation with him and even changed my username so no one would see who he tweeted that word to. What should i do????