It's a natural human tendency to complain when the things are not going according to plan.Likewise for Bitcoin,people complain they always want the prices to rise high and soar.
Yes people keep complaining because they always just want to earn. They cant accept the fact that they may loae sometimes. those people who complain are not familiar with the volatility of bitcoin. In some cases people complain because it is not what they are expecting, for example they expect that this month bitcoin price will pump but it didnt happen.