A derivative from word "retard".
A person who is subscribed to /r/traa subreddit on Reddit and loudly voices their subjective opinion on other subreddits, usually an SJW.
Some guy: His name is Felix. And it's a guy.
Other dude: No her name is Ferris and she is female.
Some guy: Other dude, are you a rtraard? Everyone here knows that Felix from Re:Zero is a dude.
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