This claim is False.
According to The Associated Press, a photo showing a man in Poland gesturing with his middle fingers at President Joe Biden was altered. The altered image began circulating on February 21st as a meme, and some versions contained the watermark of a Twitter handle that creates memes.
The original photos show an audience member giving Biden a double thumbs-up following the president’s address in Poland.
Both Biden and the White House shared the photo on their official Twitter accounts on Tuesday. The Associated Press also captured a similar photo of the same man giving Biden two thumbs-up.
Source: https://apnews.com/article/fact-check-Biden-Poland-905509390621