My friend is angry at me for "not complaining enough"?

My friend is a chronic complainer, she complains about the smallest things, every single day. I'm the opposite, but I never asked her to stop complaining, and I always listened to her, and supported her. Yesterday, she told me, out of nowhere, angrily, that I make her look bad because "I don't complain enough, and that I'm pretending to have a perfect life". I was so shocked, I couldn't say a thing. How would you respond to something like that?
My friend is angry at me for "not complaining enough"?
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