Every time some new generation starts to create its own identity, some proportion of the previous dominant generation reacts defensively by attacking it with wilful ignorance and disdain. It's a tragic way to age. Worse than a ponytail and a motorbike. If you find yourself finding smug, try looking at an old Reddit rage comic/4chan greentext/usenet flamewar, depending on your age.
Conversely, don’t expect the previous generations to quit using capitalization and periods. Your point is well taken, and thankfully I have neither a pony tail nor a motorcycle, but I am quite likely to observe 40 years of habit and driving in the guardrails of the language. Or, ya know, don’t read shit into the message that isn’t there.
Like Albus Dumbledore says in Harry Potter: If you are a young person it cannot be expected from you that you understand how old people feel. But if you are an old person and don't understand how young people feel, you are a fool, because you have been young once.