Entitlement isn’t a millennial issue because there are 71 million “millennials” (age 20 - 35) in the United States. 71 million people aren’t all entitled. You can’t even credibly say that most of them are because that’s a huge chunk of society you’d be guessing about from your small, local sample size.
On top of that there are 65 million “Gen Z” (age 8 - 20). Combined that makes 137 million people. Each of them unique individuals on their own journey.
Plenty of those 137 million are not entitled. Good, responsible people working to meet a deserving standard. Plenty of those 137 million people are entitled. Good people, but struggling with entitlement for things they don’t have and aren’t earning.
If you look at Gen X (age 35 - 50) and Boomers (age 50 - 75) you’ll see a similar pattern. Watch how they view change at work, expectations in technology, evolving social norms, and rising job standards. Some demonstrate entitlement. Some demonstrate responsibility. Some hide in between to avoid getting exposed.