You don't want to get me started.
But, as I have started, an initial disclaimer: language, at least to me, is, primarily and generally, a means of effective communication. If your point is communicated effectively, then anything goes. I get bothered by two things: 1) mispronunciation of words due to affectation and some desire to sound smart and 2) misuse of words in inappropriate situations.
As to mispronunciation:
Divisive has a long second "I," using a short one is an affectation first perpetuated by europhilic newcasters.
Controversial should end in "shul," pronouncing then ending as "ee-ahl" is horrific. It was first done by stupid newscasters trying to sound smart and then copied by politicians and those in academia. Now it is prevelant. Do we say that bush is "pres-i-dent-ee-ahl?" Or that he is "spes-ee-uhl?" Stupid, stupid, stupid.
As to word usage:
There are way too many to list, but some of the more common ones:
The use of "irregardless" can be bothersome in situations where a better level of speech is expected.
Also, "momentarily" does not mean "soon." It means "for a moment." To do something soon would be to do something "presently." To do something now would be to do something "currently."