The phrase "furious reaction" means that someone is very angry or upset about something and is showing their strong emotions in response to it. Full definition
The vote was never held after Papandreou's proposal prompted furious reactions from the country's euro - area partners and his own government, forcing him to step down. (bloomberg.com)
The high point of ideological ferment following Allied victory in World War II provoked furious reaction. (religion-online.org)
MORE: Gary Lineker sparks furious reaction from Sky Sports reporter with Jamie Carragher tweet (caughtoffside.com)