"The day of reckoning has arrived for our beautiful sport. What a sad, sad course of events," wrote another.
But at least one poster saw some logic in the IOC's popularity reasoning and pointed at mixed martial arts, the combination of boxing, wrestling and martial arts that is drawing legions of new fans.
"It's time to join forces with mma, because of its growing world wide popularity, and secure our growth and future as an essential part of its makeup. If we do not make this connection, we present ourselves as a single, fringe sport on the outside of popular" culture, one poster wrote.
The host city for the 2020 Summer Games will be chosen in September. Istanbul, Tokyo and Madrid are the finalists.