Indeed they do, but it's just plain wrong, and therefore probably deserves to be 'corrected', just as would someone who called a spider an "ant". Socket/plug is unlikely to cause confusion (either way around) but switch/socket could - so clarification would usually need to be sought.To be fair, some people actually do such things. calling a socket a plug is a very easy and noticeable example.
That's the argument that some people use to justify the way in which the word is often being used today. However, turn the clock back 50 years and we 'all knew' exactly what the word transformer meant - and that meaning would not cover many of the other things (which 'transform') the word is used for these days. However, it seems that that particular 'evolution' of language is acceptable, even to some of those who are anti-evolution!Well how does it become a "transformer"? well it transforms electric in to electric out I suppose.

