When Did Internet Shorthand Become Acceptable in Messages?

What happened to people using sentences in messages they send to each other?

Everyday, I get at least one text message from someone where they will use internet shorthand to convey a message. 

IT DRIVES ME INSANE!!!

It's written out seriously... not srsly...

You're not rolling on the floor... or even laughing out loud... so stop with the LMAO or ROFL

I don't mind seeing the occasional 'hahahahaha' or even 'that's funny'... but there's no chance that you're actually laughing out loud when you work in an office.