And it's a mistake to assume that your manager must follow the same weird typographical conventions that you do. Odds are he's never heard of them.
I’m honestly shocked there are HN users who are unaware of the tone implications.
Period. Full Stop. Point. Whatever It’s Called, It’s Going Out of Style (2016): https://www.nytimes.com/2016/06/10/world/europe/period-full-...
The Period Is Pissed (2013): https://newrepublic.com/article/115726/period-our-simplest-p...
Stop. Using. Periods. Period. (2016): https://www.washingtonpost.com/news/wonk/wp/2016/06/13/stop-...
The Secret Emotional Lives of 5 Punctuation Marks (2014): https://www.mentalfloss.com/article/59060/secret-emotional-l...
Why Does Using a Period in a Text Message Make You Sound Angry or Insincere? (2016): https://theconversation.com/why-does-using-a-period-in-a-tex...
Yes. A Study Shows that Ending Your Texts with a Period Makes You Sound Like an Asshole (2016): https://www.mic.com/articles/130042/ending-your-texts-with-a...
The tone implications are not an objective fact. They are a quirk of your social group.
As I wrote above, I'm "aware" of the implication in that I have seen it described many times. But it's not an implication that actually exists in any context I am part of.
By contrast, the belief that the ordinary smile emoji U+14642 constitutes an insult rather than a smile is a very real, and therefore more painful and annoying, part of my personal context.
You can accept it or you can ignore it. Either way, the shift has already happened whether you’ve realized it or not.
My Grandma TYPES LIKE THIS ON FACEBOOK because she insists it shows her excitement. Silly, Grandma...
For those who wonder and had to search, it's U+1F642.
It's news to me that full stops are considered rude, but then I don't have a mobile phone. I chat a lot on facebook though, and on MSN before that (with people in many countries, half of them in spanish). Always in...sentences, with full stops. Maybe text chat is a third thing, different to both texting on a phone and email? I don't know. I'd never have suspected a full stop could be rude until reading this thread though!