It's pretentious to say that it's pretentious; in fact, any use of the word pretentious is extremely pretentious, including this one. The use/mention distinction also breaks down for the word 'pretentious': it's not even possible to mention the word without being fatuously pretentious. This is especially true if the criterion for pretentiousness is whether "most people" would know what it is.

'Autodidact' is another matter.