Azarenka tells umpire 'you probably weren't very good' at tennis

Here's the video of today's short, but awkward conversation. 

Azarenka: "Have you ever played tennis?"

Umpire: "Yes."

Azarenka: "You did? You probably weren't very good."

Azarenka went on to win 6-1, 6-2 in straight sets.

Here's the point in question.