According to dictionaries, the term nitty-gritty is defined as 'The fundamentals, realities or basic facts of a situation or subject.' The heart of the matter'.  One theory is that "nitty-gritty" refers to the debris left in the bottom of a slave ships at the end of a voyage - the meaning extended to slaves. Hence, use of the term is highly contentious and has been banned by the police.
In ignorance of this, Home Office minister John Denham used the term during a speech to the Police Federation Conference. "[T]hey don't normally get into that nitty-gritty," he said, only to find himself being challenged by a delegate who said officers were banned from using it because of race relations laws. Officers later said it was just an example of how the English language had been turned into a minefield of political correctness. The view that "nitty-gritty" has slave connotations "may belong in the same line of folklore which holds that a picnic was a slave lynching party," writes lexicographer Michael Quinion in his World Wide Words website.

Faggot
The use of fag and faggot as a perjorative slur term for a gay or effeminate man has become understood as an Americanism in British English, primarily due to their use in films and television series imported from the United States. When Labour MP Bob Marshall-Andrews was heard supposedly using the word in a bad-tempered informal exchange with a straight colleague in the House of Commons lobby in November 2005, he was criticised for using homophobic abuse.
 

Chinese Whispers
Chinese Whispers game is often invoked as a metaphor for cumulative error, especially the inaccuracies as rumours or gossip spread, The name "Chinese whispers" reflects the former stereotype in Europe of the Chinese language as being an incomprehensible and unprouncable combination of sounds. 
 

Political Correctness
 Wikipedia defines Political correctness as a term that is applied to language, ideas, policies, or behavior seen as seeking to minimize offense to gender, racial, cultural, disabled, aged or other identity groups. Conversely, the term "politically incorrect" is used to refer to language or ideas that may cause offense or that are unconstrained by orthodoxy.
 

 

 Stephen English, 56, who is heterosexual, was repeatedly called a "faggot" by workmates purely because they found out he had been educated at boarding school and lived in Brighton, the Court of Appeal heard.
The colleagues knew he was not gay but still suggested, in an in-house company magazine, that he had worn "skin-tight Lycra cycling shorts" to Brighton's Gay Pride parade.
Mr English, 56, who worked as a sales representative for blind and awning maker Thomas Sanderson of Portsmouth, claims he had to leave his position because of the campaign of abuse.
He made a compensation claim for sexual harassment but it was initially rejected by an employment tribunal, and then by the Employment Appeal Tribunal.
However, the Court of Appeal reversed those decisions saying Mr English had been sexually harassed by the homophobic comments and it was irrelevant whether he was in fact gay or not.
It was also irrelevant that his colleagues knew him not to be gay really, the court ruled.
Lord Justice Sedley said: "The incessant mockery - `banter' trivialises it - created a degrading and hostile working environment and it did so on grounds of sexual orientation,"
Mr English has been married for 20 years and has three teenage children.
The case will now return to an employment tribunal to assess how much he should be awarded in compensation.
John Wadham, Legal Director of the Equality and Human Rights Commission which backed Mr English's case, said: "Bullying is unacceptable, whatever your background - gay, straight, black or white. The fact that Stephen English's colleagues knew he wasn't gay does not excuse their behaviour.
"Until now victims of this type of abuse had little or no legal protection. This has helped to clarify the law to protect those who suffer harassment based on old-fashioned stereotypes."

Source: Telegraph