I am writing to apologize for my condescending attitude towards you. I understand that my words and actions have caused you distress and I am deeply sorry.
I am aware that my behavior was inappropriate and I can only offer my sincerest apology. I understand that I have hurt your feelings and I am truly sorry.
I want to assure you that this is not how I normally act and I can only attribute my behavior to a momentary lapse in judgment. I understand that this does not excuse my behavior and I am truly sorry for the distress I have caused you.
I want to take this opportunity to apologize for my words and actions. I understand that I have caused you pain and I am deeply sorry for that. I can only hope that you can forgive me and that you can find it in your heart to accept my apology.
I want to assure you that I will strive to be more mindful of my words and actions in the future. I understand that my behavior was unacceptable and I am committed to ensuring that it does not happen again.
Once again, I offer my sincerest apology for my condescending attitude towards you. I understand that my words and actions have caused you distress and I am deeply sorry.