Yes, it seems that the protestors are angry in part because they believe the government is adopting policies that have an unfair impact on rural, and often lower-class, workers. It is not limited to a protest about fuel taxes, which is one reason the protests have continued for so long.
One thing I love about France is that its citizens do not hesitate to be disruptive over policies that are deemed unfair. It is messy but a crucial part of the country’s democracy.