My two pet hates, like, are the quasi-like random insertion, like, of like in speech. It appears to be the default now when the mental buffer empties, instead of a polite pause, like.
My children, now all in their twenties, have two modes of speech: "when Dad's around" and t'other. The frustration is that, although they know it's egregious abuse of an otherwise very useful preposition, they feel no shame, even though they are quite capable of having an intelligent conversation normally! To be fair, my son, the oldest, doesn't do it, and detests it, as I do, however the girls switch - chatting to mum, and talking to dad!.
The other 'worst' horrors in common use now, which diminsh the value of English as the best language on the planet, are two: "impact" which is (a) what bullets cause (and vehicles in crashes), and is never a verb. The perpetrators of this crime usually mean "effect" (the noun), or "affect" (the present participle, i.e. the verb form). Finally, there's a warrant out for users of "due to" (for people), when "because of" (things) is their intended meaning.
And apostrophes should be trained to be utterly vicious from the instant they hatch, such that any attempt to abuse them results in the perpetrator being nastily bitten. Children and young adults can be so cruel...
E.