extension-only files don't get excluded

Sorry if the subject is a little confusing, here is my problem;

In my source directory is a lot of hidden files. I don't want to synchronize these files to my USB drive. The files basically consist of an extension only (".bashrc" is a good example)

I have specified ".bashrc" in the exclusion box, but the file is still copied. There's quite a lot of these files in the main directory, and removing them is not an option.

I hope you can enlighten me on the matter