The phrase "a discourtesy" is correct and usable in written English.
It can be used to refer to an act or behavior that is rude or disrespectful.
Example: "Failing to respond to an invitation can be seen as a discourtesy to the host."
Alternatives: "an insult" or "a rudeness".
It's a discourtesy to the House to be long-winded, especially when exhorted not to be," he told the MP, who was in the middle of spekaing.
One thinks of Primo Levi in 1948, feeling that If This Is a Man, his memoir of the Holocaust, was a "discourtesy" in the forward-looking postwar world.
The PAC went further, describing the BBC Trust's attempts to negotiate the terms of NAO access as "unacceptable and a discourtesy to parliament".
Earlier this week the Met said Britain's top officer would not be present and some members of the Metropolitan Police Authority warned his failure to attend would be seen as a discourtesy and sour relations.
But he became better known as the man whom Steinbrenner dispatched to fire Yogi Berra as the team's manager just 16 games into the 1985 season, a discourtesy (Steinbrenner's, not King's) that ignited a feud that kept Berra from Yankee Stadium for 14 years.
It was a small transgression, it may have been little more than a discourtesy—I'm not sure but like Beau my dad had a bit of a reputation for being the kind of agent you didn't want to hear from if he was angry, so, uh, the folks at BMW probably weren't thrilled to be dealing with him.
In a scathing outburst against the Business Secretary, Mr Bercow said: "It is a considerable discourtesy, or incompetent or both for a Secretary of State to take twice the length of time that is allocated for answering an Urgent Question".
It's a notably adult production, with ocean-themed innuendo running wild, from dirty talk on "shellphones" to the dangers of catching crabs to a physical discourtesy that's known simply as a "fishting".
Rojo seems to sense she may have spoken a small discourtesy.
For all the concern about the effects of nihilism on society, the impact so far has been confined mostly to petty vandalism, thievery, a relatively minor drug problem and an aggressive discourtesy.
(There's no bibliography, either, an inexplicable discourtesy both to readers and to the many scientists upon whose published papers and books this volume draws). McPhee is an elegant stylist, but to say that his authorial voice is muffled and reticent would be an understatement.
