You shouldn't complain about not seeing displaynames after choosing an app that doesn't show displaynames. Unless you plan to complain to the developers and request the option.
Drag can see that you have configured Lemmy to show usernames instead of displaynames. Drag's username is dragonfucker. Drag suggests learning how to use Lemmy properly before calling people who understand the software better than you liars.
Drag is not referring to dragself by drag's name. Drag is referring dragself by the pronoun "drag", while drag's name is Dragon "Rider". Drag would like to remind you that drag's name is perfectly visible on your screen and you can read it whenever you like, so you don't need drag's help to know what drag's name is.
Drag's pronoun is in brackets in drag's display name. Drag wonders why you choose to complain to other people about your own decision not to read the things on your screen.
Drag is not going third person. Drag is using first person neopronouns. Drag is happy to teach you about grammar structures you're unfamiliar with. Drag prefers drag's pronouns over gender neutral pronouns like "I" because drag's gender is not neutral.
In Japan, there are multiple first person pronouns depending on the speaker's identity and indeed the specifics of their current social situation. Like watashi, boku, and ore. Drag is doing that.
Okay, how about He-Man? Is He-Man not allowed to use he/him pronouns?