(CNN) Greta Thunberg's tweet about riding on the floor of a train didn't sit well with German railway company Deutsche Bahn, which said she had a seat in first class.

"Traveling on overcrowded trains through Germany," the climate activist wrote. "And I'm finally on my way home!"

Traveling on overcrowded trains through Germany. And I'm finally on my way home! pic.twitter.com/ssfLCPsR8o — Greta Thunberg (@GretaThunberg) December 14, 2019

Some Twitter users responded to Thunberg by criticizing the company, which has had a reputation for delays and other performance issues in recent years.

At first, the railway company seemed to express solidarity with Thunberg and her activism.

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