I work as a professional writer/translator and use three different languages regularly. Even I have some words in each language that always give me trouble for some reason. I type what I think it should be and let spellcheck fix it. Bureaucracy and anesthesia are a few that come to mind.

It's not offensive at all. No one is perfect with these things. Maybe you can take it as a learning experience to check the correct spelling and try to remember it.