Carlsen didn’t actually say nothing. That’s the heart of the issue. He posted a semi-cryptic tweet then resigned after one move during their next game. He is

Carlsen didn’t actually say nothing. That’s the heart of the issue. He posted a semi-cryptic tweet then resigned after one move during their next game. He is manifestly trying to imply something which greatly impacts another player while avoiding actually saying it which most people tend to find frankly disrespectful and a bit childish.