The problem is not bitcoin's energy usage
per se, the problem is that proof-of-work is a feedback loop where the more one person mines, the more everyone else needs to mine to keep up. In other words, the mere existence of proof-of-work puts a
floor on the price of energy; in the presence of proof-of-work it is
impossible for us as a society to ever have energy that is "too cheap to meter", because when the price of energy falls below the production price of bitcoin it economically incentivizes more miners. It's self-fulfilling conspicuous consumption for the electronic age.
In contrast, one person blow-drying their hair does not create a feedback loop of more people blow-drying their hair.