Agreed, I don’t see it as passive-aggressive, I see it as using proper punctuation. I’m an oldie, though, and most of the people I text know what I mean when I type. If someone were to react negatively to putting a period in a text, I’d implore them to talk to me about it instead of assuming motive that isn’t there. Then if that doesn’t help, well, guess we won’t be texting each other anymore. I don’t have the time or energy to play silly misinterpretation games with someone who can’t communicate like an adult.