Kate, for what it's worth, I think I've read roughly have of your 3495 posts (and counting) and never once did I find you to be rude or offensive!
You do often come across as hurt, angry, frustrated, and confused, but never rude, at least not to me.
That's just my 2 cents, or 2 pence in your case!
Oubliette
PS: I just read your thread about your Asperger's, which is something I am familiar with. That fact that you even care about whether or not you've offended someone is, in my experience, atypical of a person with Asperger's.
My suggestion is that if you are going to make a statement that could possibly offend, take a moment to think about how the other person may interpret your comment. This will likely be hard for you. But thinking before speaking and/or writing is always a good thing.
Welcome feedback in this regard from others and take the time to be instrospective. Give yourself time to develop your empathic skills. Learn how to communicate more sensitively and persuasively. It's not always what you say, but how you say it that matters to people. As much as we'd like to think we are very calm, logical, rational beings, we are more often than not simply emotional beasts responding without thinking.
Finally, realize that no matter what you do or how you do it, someone, somewhere will be offended. That is their problem.