You see, our brains are meaning-making machines and will try to make meaning make sense even when it does not, and will fill in words it thinks it hears. The school game telephone (also known as Chinese whispers) exploits this property linguistically known as a mondegreen, which got its name through Sylvia Wright’s famous mishearing of the poetic line “layd him on the green” as “Lady Mondegreen.”
Being able to speak a language is subjective. I have many Japanese friends who speak beautiful English but do not consider themselves to be English speakers.
Isn’t it interesting that humans have feelings about the words that we use to express feeling?! This is property is called Phoneaethetics.