Then it comes down to a pedantic discussion of definitions if we're talking about a/any/all/none a single action vs. a series of actions, the qualities of the invitation, etc.
For example, besides from extreme exceptions, it's definitely rude to decline an invitation to your sister's wedding because you don't feel like it.
Likewise it's definitely not rude to decline an invitation to lunch with the coworkers you eat with every day to prepare for an important meeting.
Digging into the weeds about what we really mean by "entitled" and "rude" is probably not productive.
For example, besides from extreme exceptions, it's definitely rude to decline an invitation to your sister's wedding because you don't feel like it.
Likewise it's definitely not rude to decline an invitation to lunch with the coworkers you eat with every day to prepare for an important meeting.
Digging into the weeds about what we really mean by "entitled" and "rude" is probably not productive.