i think it is fair to say that most Whovians are not a fan of the current companion Clara. I actuall found a very awesome analysis that shines some light on her character and why she acts the way she does...
Has The Doctor created a monster?
Clara Oswald is very different from pervious companions in Nu-Who in that her travels and experiences in the TARDIS have not made her a better person.
Rose, Martha, Donna and Amy were all pretty normal young women who didn't think themselves to be special in any way but The Doctor obviously saw their hidden potential to be amazing.
They each grew as people during their travels and demonstrated selfless acts of heroism to save the world, The ...Doctor and the people they love.
When we first meet Clara in "The Bells of St. John" she is a sweet kid who wants to travel the world but has put her own happiness on hold - indefinitely - because her friend's family needs her. The Doctor whisks her away, not because he sees her potential, but because he is mad with curiosity about the Impossible Girl. She is more like a puzzle he needs to solve than a companion at first.
Their adventures together see them growing closer as friends but then Clara has the traumatic experience of seeing The Doctor regenerate into an apparently completely different person.
How does she deal with this?
Does she feel betrayed that her friend, for whom she has performed some incredible feats to save, is now this grumpy old man who doesn't like hugs or any displays of affection?
Where previous companions wanted to be The Doctor's lover and, failing that, his best friend Clara decides that she will become The Doctor's equal.
She remains steadfastly unimpressed by his cleverness and gives as good as she gets in an "I'm just as good as you" fashion.
She learns to manipulate people as he does. She learns to lie to people as he does. In fact she becomes so adept at lying that it becomes a compulsion. She has great difficulty telling the truth any more.
Worst of all, she becomes more selfish.
By the episode "Dark Water" this once sweet kid who had put her own wants and needs aside to help a friend is now willing to destroy all 7 TARDIS keys in an effort to blackmail The Doctor into doing what she wants. She knows it's wrong but that won't deter her.
Of course The Doctor forgives her. Maybe because he realizes that this is his fault. He has made her into this.
Don't get me wrong. I like Clara. She has certainly grown as a character from the one-dimensional sweet kid to the complex, narcissistic, lying control freak she is now. She's come a long way but as The Doctor himself said, "You were an exceptional Doctor, Clara....... Goodness had nothing to do with it.""
For me, this made perfect sense. It actually made me appreciate the character a bit more and now I understand her better.