Peeved by mass ignorance

I speak English. Most others think that they do or even that they know how, however, there are some cases of mass confusion about proper grammar that irk me. These are publicly accepted, albeit erroneously, phrases or words:

“Shine bright like a diamond.” – Ever heard of adverbs? They are words in English used to describe verbs, unlike adjectives that are used to describe nouns. Ergo, a grammatically correct phrase would be, “Shine brightly like a diamond.”
“Turmeric” – For some reason, whenever someone pronounces this word, they leave out the first “r” sound and pronounce the end as the name “Eric.” It’s, say it with me, people, “ter-mer-ic.” It is almost phonetically impossible to get confused, but it is as though people hear the word from others before they see it themselves. This means that the person saying, “toom-air-ic” has no idea what turmeric is and is a waste of time.
“What’s the difference?” – Usually spoken to imply the perception that there is a complete lack of a difference between two subjects of concern. Using an inquisitive meme as an argument shows the user to be incapable of observation and original thinking. It is used to mute the conversation by those of muted intelligence caused by alcohol, cigarettes, years of eating a Standard American Diet and watching corporate television.