As a laid writer I understand the difference between slack phone typing and a published piece, and how it's sometimes just not necessary to apply conventional standards
I guessing was a muscle-memory related typo, as often happens when creating informal text. And if your name is Johnson you shouldn't be acting like a D*ck.
if you are offering such advice you need to have professional certification. Are you registered with FBDBA? (Foreign Babbling Dickheads of Bangkok Association)? You do sound highly qualified but by law you must post your membership number