Have you never watched Phonejacker?Things like PLC, HTML, MP are not acronyms, they are just abbreviations. You could not speak them aloud as full words: you have to spell out their individual letters.
I was tempted to post a "thanks for the info", but really you cannot rant at people for "misnaming" a group of letters when in fact the classification of a word as an Acronym rather than an Initialisation is down to popular usage rather than a strict set of rules based in the English language or any other language, EVERY initialisation can be spoken as a "word"... But it is popular use which defines it as an acronym or not.
Language changes over time, popular usage of Acronym is to descibe an initialisation, eventually it will be accepted norm in dictionaries, thesaurus' etc... It is already in general use.
Even the dictionary descibes HTML as an acronym.