Why does the passage say ‘not everyone is celebrating’?

Directions: Read the given passage carefully and answer the following question. 

The long fight of Nepalis to have a constitution written by representatives of the people is over. The fight that lasted 65 years, saw a civil war and multiple major revolutions - along with a century old monarchy toppled in the process. The new constitution, which took more than seven years to draft, was overwhelmingly endorsed in the constitutional assembly - a constitution-making body comprised of 601 elected lawmakers. The three prominent parties - Nepali Congress, the Communist Party of Nepal and the Unified Communist Party of Nepal (Maoist) - collaborated for the majority while few other smaller opposing parties either voted against, or boycotted the process. The civil war, instigated by Maoist rebels, lasted for 10 years, from 1996 to 2006 and claimed more than 15,000 lives. With the signing of the Constitution, it is also now officially over. More than 80% of the country's population is Hindu - the largest Hindu majority in the world- will remain secular as per the new constitution. But not everyone is celebrating. A handful of groups representing a number of ethnic minorities have denounced the new constitution. The smaller opposition parties representing the Madhesi and Tharu indigenous groups have been the most vocal opponents of the new constitution. Lawmakers from the parties boycotted the final voting process.