This is obviously my own opinion, but I see being blunt regardless of context as a social habit that one grows out of, not something that one grows into. I certainly haven't personally found it useful to become more rude over time, quite the opposite.

From a tribal affiliation standpoint, we are often reflexively portrayed as "the ones who value truth and honesty above feelings," as if this necessitates that feelings not matter at all, or that they not exist, which is totally contrary to the truth of human psychology and how our interactions work.