You mean here
"I came home and went into the kitchen where my mother was peeling potatoes?"
By myself I notice this, but being a person who writes intuitively correctly, I do not point out to a person his shortcomings. Because, for example, I don’t know at all where it would be necessary to put pinning marks here. And you need to start with yourself!
"Sign abuse" can be understood as:
"Fuck !! 1111"
" Are you serious ??? !!! "
(My text is from another question)
I think it's very simple. Punctuation rules, and / or vocabulary and / or the size of the resulting text (subject to the first two points) and / or the reluctance to use emoji (graphic emoticons) can not always convey the author's emotions.
And it turns out just what you are talking about.
Do you remember the tendency to scold everyone you meet for illiteracy? The absence of commas was especially condemned. Maybe especially quivering girls are now trying in every possible way to correct themselves and put commas, just in case, in any free place :) After all, if there is no literacy or intelligence, then it will not be, and it takes the most unexpected turns.
They may be converting spoken language to capitalization. They put punctuation marks where they would pause in the conversation. In this case, the rules of punctuation are ignored. I myself am constantly sinning. :)
Among them are my peers, I'm 40.