That is part of a real convention in active use, influenced by the medium of text on phones and computers. People replace full stops with newlines/message break

That is part of a real convention in active use, influenced by the medium of text on phones and computers. People replace full stops with newlines/message breaks, and over time they start to repurpose the now-unused punctuation for emphasis. It's not surprising that new linguistic conventions cause confusion, but that doesn't make them something to deride.