Dont worry about it....I think you will find that most of the younger ATCO's coming into the job couldn't tell the difference either between a 757 or a BAC1-11..!!....It's a fact, in days gone by most of us coming into the job came because we had an interest in aviation ( dare I mention the word spotter ) nowadays folk leave Uni without a clue what there going to do...they see an advert for ATC then they see the salary....job done.
Errr, wrong. Aircraft recognition is an own class, embedded in the Common Core Contents.