Bad English habits

It has been pointed out to me that apparently I picked up some bad habits as a child in England in the 1960's. This seems to be corroborated:

Brits giving glowing reviews:
"I didn't mind it"
"Not too bad at all"
"Did the trick"
"Yeah, pretty good"
"Better than expected"
"Fine"

— VeryBritishProblems (@SoVeryBritish) May 26, 2016

Recently, having had a half day demonstration of a groundbreaking new technology, I summarized my response to the team with, what I thought, was an effusive "Neat". Seeing the crestfallen faces, I amended it with a yet more effusive "Pretty neat." I am still being mocked.