A point refuted a thousand times, commonly abbreviated as PRATT, is a common phrase on internet forums where debates have a tendency to go in circles. Once people have refuted a point the first thousand times, it's hard for them to muster the motivation to do it again. Once someone has labeled an argument a PRATT, that usually means they have no interest in discussing it. This could itself be a diversionary tactic.
The website talk.origins acts as a repository of PRATTs commonly used by creationists, and presents (usually in great detail) their refutations and science behind them. The site is a good starting point when facing a PRATT.