I've never referred to it as medicating when it comes to my own personal use, But I really respect those that have chosen to call it such.
They're giving it more meaning than stoners ever have. That's why we're seeing a bigger outbreak of modern day people using cannabis for medicinal purposes. They don't want to tell people they "get high" or "get stoned". Because they're not after the "high" they're after being medicated for whatever symptoms they're using it for. Even if it's as simple as helping the person sleep, They're medicating. I wouldn't call taking Ambien "suckin' down some Amb's man" I would say I'm medicating myself to sleep. Same thing with Cannabis.
I'd rather see the terms "I'm getting high" or "I'm getting lit" disappear way before I would want the term medicating to stop being used as widely. Let's face it here, We're on a path to full legalization and if you show up looking like and sounding like what the world has painted a dumb stoner to look and sound like, You're not going to benefit anything.