I am not a teacher.
I'd be interested to know which dictionary told you that. Could you provide a link to it?
If it's a question of RP (Received Pronunciation) then it can't be too posh. It just is. I speak RP because I grew up and was educated in a part of England that uses RP as a standard, but I pronounce year as /jɪə(r)/
I can see a stab at humour in your post, and I do understand what you mean, but the real question you should ask yourself is 'What sort of English do I (want to) speak?'
You can't pronounce some words one way because you don't want to sound like this, and other words another way because you don't want to sound like that. You have to be consistent.
Student or Learner