Sounds similar to echolalia, which I believe is a common autism symptom. A person with echolalia may have difficulty forming complete sentences, and will prefer “recycling” sentences they have heard before.
I wouldn’t call it “lazy” if its legitimately a mental disorder. Laziness implies a lot more agency and choice.
That being said, I’ve found many autistic people are open to communication lessons if offered with kindness. Its just that teaching takes time.