Then take back the apology by saying immediately afterward: "...though just when responding to posts that were insulting and rude to me," thereby excusing your behavior.
You admit: "I realized that I might have at times been rude to someone who had not initiated that rudeness with me."
You then go on to list all the various justifications for your behavior, as though others are at fault for what you have chosen to do. As you say, "In any case, that is my excuse."
You then close with the admission that you are going to continue in the behavior for which you are supposedly apologizing, and doing so for all the same justifications and equivocations you have already listed - i.e., it is everyone else's fault that you are rude: "Finally a warning to others: For so long as you continue to be rude to me, I will likely respond in kind. And, if you continue repeated the same illogical questions over and over, I will likely become increasingly 'testy' in my responses to you."
What kind of apology is that?
If you are truly sorry for what you have done, take responsibility for it - without excuse or justification, repent of it wholeheartedly and sincerely, and change your ways.
Given the huge volume of posts, in a later review, I realized that I had initially confused some of the posters who hadn't been rude with those who deserved to have rudeness returned to them. Ergo, the dual nature of my apology.
I hope this explanation clarifiy the one that I initially attempted above.
In any case, as complex and confusing as my apology was, I want to assue you and others, again, that it was sincere - but, again, only for those FEW that deserved it.