Your new friend has demonstrated clanging.
Clanging is a mode of speech described by connections of words or phrases joined only by sounds and not by meaning. Clanging is a behavior that is circumstantially unsuitable. Clanging may include uncontrolled and unconscious rhyming or repetition of sounds without clear logical association between words. Also, clanging is indicative of some mental disorders such as mania and schizophrenia.