Because the world is exposed to Russian many say Lithuanian sounds as Russian. Obviously, Lithuanians don’t like it.
Here young people speaking.
@MikhailA Cover of ‘Aš Bėgu’ (I run song) is self explanatory. ‘Aš’ is ‘I’ in archaic Slavic. Bulgarians are still using it. Bėgu is just ‘begu’.
The same song in Russian