In all honesty I think there has to be a level of understanding in this situation instead of high expectations.
Justin and Jessica both have hectic lives and a lot of responsibilities come along with their jobs, so you cannot expect either of them to be in the best of moods 110% of the time whether in the company of friends or family.
Its bad enough they have to portray a certain level of politeness for the public and in their job roles.
Now just because the other side of their characters are not on display 24/7 does not mean they are rude, cocky or arrogant it only means they are actually human
I mean neither of them are robots are they so we should not expect them to maintain angelic attitudes.
Remember Justin can have bad days too.