Many people feel free to blurt out whatever nonsense comes to mind, or to act in a clumsy and thoughtless fashion, regardless of how their words and actions might be perceived by others.
I'm thinking for example of the dozens of employees of Clarence House, the King's current residence, who were abruptly informed by email that they would be sacked. Could they not have been given the news in person?
I'm thinking of all those people who criticise celebrities, picking holes in every aspect of their personalities and their lives, oblivious to how upsetting this might be to those on the receiving end day after day.
Likewise, all the abuse directed at frontline employees who're simply trying to do their job and aren't responsible for their employer's failings - shop assistants, doctors' receptionists, paramedics, call centre staff, delivery drivers.
Then there are the MPs bullying and harassing their personal staff, who are expected to put up with such behaviour by "taking the rough with the smooth".
Some people might say that Brits habitually employ a very British form of tact - not mentioning a subject at all in case they offend someone. They avoid sensitive subjects like religion, politics, the royal family, transgender and relationship breakdowns for fear of the reaction.
But it seems to me that nowadays such diplomatic silence is not so common and people are holding forth on anything they feel strongly about, regardless of how it might go down with their listeners.
Do tell me I'm wrong and there's plenty of tact around - I'm just not noticing it.