Just like with Star Trek, people freak when they find out not everyone in the cast is buddy buddy, or anything like their onscreen persona.
It's a fun job, (sometimes) but it's still a job. And they probably sometimes get sick to death talking about films they worked on years or decades ago. When Mark Hamill stiffs some orphans, then I'll get upset. ;)
And for the record, Mark has been a voice actor long before Star Wars.
It does sound like Anthony Daniels needs to lose the restraining bolt though!