Definitions by QRM
ratingist
Prejudice towards, or discrimination against someone on account of their chess rating, especially against low-rated players. The tendency to mock or look down on low-rated players. Can also more rarely be used when someone is discriminated against because of their high rating (for example in rating-limited tournaments). Ratingism is a form of chess snobbery, and it is generally regarded in polite circles as "bad form" for a higher-rated, more experienced player to look down on or engage in derogatory comments or bullying towards beginners and less experienced players.