Because a few teachers are instagram influences doesn't mean that "Teachers" as a profession are doing this widely. You could pretty much replace the word teachers with any profession and this would probably hold true.
Reporters and editors are people with a knack for language. They understand that for this phrase, the gap between denotation and connotation is a chasm. That we see this particular phrasing constantly anyway suggests a certain malfeasance.
I'm really tired of having to read my news adversarially.