And then, she reacted.
Underwood stayed on social media for a while, thanking people for their feedback - all good - and even answering a few random questions while she was at it.
Like when morning news hosts Kathie Lee Gifford and Hoda Kotb said they adored her:
When Kelsea Ballerini told her she was "STUNNING":
Then her fans started with the questions and general comments. The best of which was, "Have yet to find a flaw in @carrieunderwood."
She responded immediately to that one, with a few of her flaws:
And when another fan accused her of blocking him, she admitted she does block some people. But only meanie faces.
Finally, at around midnight, she had to log off.