Don't care. I don't live my life to please others, and I'm not going to stop using periods because some linguistically ignorant doofus thinks texting is the proper arena to create new language rules. Texting is supposed to be casual and fast, and likes to use single numbers, single letters, and emojis to communicate, as well. It's fun, but it shouldn't be influencing the language enough that it becomes acceptable in literature, instructional manuals, legal documents, news reports, etc. Now you want to apply a whole new slew of grammar rules to something that was supposed to be NOT THAT.
Too bad if your precious feelings are hurt by a Passive Aggressive Period, or a Snooty Question Mark. Grow the fuck up.