Ignorance and lack of courtesy are not one and the same thing.
What gets me riled is not the correct pronunciation of the G, but the subsequent choice to mispronounce the E as a U, as mentioned in the thread title.
Done once by a comedian in a comic circumstance it can be seen as a rather weak joke, in questionable taste. Done (repeatedly) by supposedly professional newscasters in a serious context it argues either inexcusable rudeness, or an ignorance of which the BBC should be ashamed.
Incidentally, educated and intelligent are not synonyms either.