1) Saying something correctly but unnecessarily complicated - for example, when a project manager says, "We do not have financial resources for that," instead of simply, "We don't have money for that," when declining a team dinner (a CFO's report is another story).

2) Saying something incorrectly - for instance, "It is really flustrating."

I've started to dislike the latter more. The former involves people who at least use correct phrases, even if they're trying too hard to impress others. The latter indicates people who simply don't read.