This is a 2-in-1 question, I suppose. I type the way I do. I’ve always typed this way, but I’ve noticed when interacting with people (not on here) that people always think I’m far older than 19. They think I’m in my forties or fifties.
Also, I tend to type using full stops, which people may think are rude. When I’m typing a full sentence, though, I end it with a period. If I say, “He’s being an asshole,” (with a period), I mean that as a fact, not out of anger. It just happens to be ended with a period since it’s a sentence.
The iPhone keyboard requires 2 taps for punctuation, including periods. Americans (and iirc especially younger ones) use more iPhones than Android phones (don’t know about other countries, but OP indicated in a comment that they’re in the US). I’m not some old guy saying the youngsters are just lazy, but I do think the iPhone keyboard is a factor in how text-based communication has evolved.