Embeded lexicon

Knock, knock. Who’s there? Smee! (It is me.) (Or, Sigh ‘It is I.’)

Everybody seems to ignore the proper case in using ‘I’ and ‘me.’ As a matter of fact the proper use has actually become strange sounding.

The Italian language has gone bonkers. It uses ‘me’ as a subect of a sentence. Has our lexicon become corrupted too?
Frank