thanks for the confession, you are simply guilty of ignorance. I on the other hand am guilty of thinking the English and the French both sound pretentious about pretty much everything: they are both always judging people.

here you go, some straight facts:

https://www.dailywritingtips.com/a-historic-vs-an-historic/

including "The Google Ngram Viewer provides an interesting look at the progress of “an historic” vs “a historic.” In 1800, “a historic” barely shows. It begins its rise in the 1820s. In 1869, “a historic” is neck and neck with “an historic.” The two travel along fairly close together until the First World War when “an historic” pulls ahead and dominates until 1938. After that, “a historic” becomes the clear winner, although “an historic” and “an historical” remain in use. Here are two recent examples of the use of “an historical” in the context of educated English..."