[s73v3r_]

If someone has stated what they wish to be called by, and rather than respecting their wishes, you choose to go down a tangent on how what you said is not a problem, then that is condescending, whether you intended it or not. Although I would have a very difficult time believing that someone who did that did not intend to be condescending.

[johnminter]

From the context supplied it appears to me that this was a first offense. If it were a repeat offense, I would agree. I still recommend a softer tone. If your goal is to maintain a healthy collaboration, that helps. Either way, the offended party is inferring motives that may or may not be accurate.