Fears of inflation are absolutely bizarre when we have a Fed that has been sociopathically concerned with "fighting inflation" for decades. And fighting inflation is extremely easy! It isn't a difficult problem to solve if the people in charge, for better or for worse, want to solve it. There shouldn't be any worries about a too low unemployment rate because if inflation ever does start to rise the Fed can always jam on the brakes.
The Fed is overly committed to preventing high inflation, and preventing high inflation is extremely easy for it to do. It's not something anyone should ever worry about.