BBC Article "Native English speakers are the world's worst communicators" (link below)

"When such misunderstandings happen, it’s usually the native speakers who are to blame. Ironically, they are worse at delivering their message than people who speak English as a second or third language, according to Chong.

“But… often you have a boardroom full of people from different countries communicating in English and all understanding each other and then suddenly the American or Brit walks into the room and nobody can understand them.”

The non-native speakers, it turns out, speak more purposefully and carefully, typical of someone speaking a second or third language. Anglophones, on the other hand, often talk too fast for others to follow, and use jokes, slang and references specific to their own culture, says Chong.

“The native English speaker… is the only one who might not feel the need to accommodate or adapt to the others,” she adds.

Dale Coulter, head of English at language course provider TLC International House in Baden, Switzerland, agrees: “English speakers with no other language often have a lack of awareness of how to speak English internationally.”"