My current work allows me a pretty decent look at literally thousands of different IT infrastructure set ups by this point only half a year in, and I'm still explaining the basics of IT administration, infrastructure, SQL queries, and so on to people with the title "Senior ______" and a list of certifications that adds a good 4 MB to each of their emails for all the banners.
Try not to worry about it, and don't enable them either. Be professional, but be firm. I won't promise that they will get their comeuppance or that you will be rewarded, but you can at least leave every day not having to look over your shoulder or double checking that you covered all your bases. In the long run, you'll have the knowledge to do what is necessary for future growth in your career, they will have to keep inventing new ways to fake it.