The scale shows it being 20 microns in width, so it's still pretty big, relative to individual atoms. A micron is 10^-6 meters while the width of a hydrogen atom is about 10^-10 meters.
Violins are traditional instruments of cinematic mourning, either as background melody or very famously used literally in Titanic where the orchestra kept playing right up until the ship went down (historically accurate).
Spongebob Squarepants later had a one-off gag where Mr. Krabs wanted to express insincere mourning, so he pulled out a finger-size violin and said something to the effect of "Oh boo hoo. Let me play you a sad song on the world's tiniest violin"
Of course, being Spongebob Squarepants, the gag was executed so flawlessly that it was immediately seamlessly integrated into internet culture.
Turns out the internet has tons of people like them. People who state things authoritatively but are actually just saying things without doing any verification or checking.