What she's saying might be true, but it probably doesn't mean that the individuals spending a year or more couldn't still get homesick. But, whatever. It's not like Rita's here to grill people over what their feelings might or might not be. There are plenty of more important things to concern herself with, such as...

"You're a Gem?" Rita gives Peridot a long stare, her interest suddenly piqued. She heard about them before, but despite all the questions she asked then, she still didn't know what to expect.