I’ve experienced that same reverse culture shock a few times in this life, when coming home to the U.S. It can almost be overwhelming to someone who’s been away for a number of years.
The worst culture shock I ever had was coming home after a three year tour. We walked in to a supersized grocery store in SoCal and I had to leave. After shopping in our little commissary for so long, the choices truly overwhelmed me. Most people have no idea how blessed we are.