Greetings to the men of Omega Psi Phi Fraternity, Incorporated.
I have a question that I'm asking respectfully. I attended a function hosted by your fraternity called a Mardi Gras. I saw some men that I worked with whom are members of your org, we sat back and talked.
This chapter just had new members cross this year and I greeted a guy that I knew from work and grad school; it was a shock to me because I never knew that he desired greek life. Long story-short... I congratulated him and I turned to my good guy friend who is also a Que and said I didn't know that "cat" wanted to be a Que.
OMG...this guy(newly initiated) flipped out!

stating not to call him "Cat"! The older member that I knew, pulled him aside and a few minutes later the guy apologized to me for his behavior. I felt that it was really uncalled for how he acted.
My question(s) are: What did I do wrong -and- why did he trip out like that over the word "Cat"? If I asked anything inappropriate... I apologize, that certainly is not my intent.
I just need some guidance concerning this matter, so that I won't do anything wrong again. Even though I'm not really sure what I did wrong in the beginning. I would really appreciated some feedback. Anything that I'm told/written is greatly appreciated.