A peeve

"Back in the day." Give me a break. One particular day? If some ideal nostalgic conditions prevailed for just one day, why would you bother mentioning it? Besides, where do you get off claiming some sort of primacy for your past experience (as THE day) without any sort of explanation or modifier?

If you say "Back in the days when ... [I had hair; spelling mattered; you could lock your car without honking the horn]", then I'll listen to you.

Thank you.