These are some possible starting links for learning about language ideologies / 言語イデオロギー: cultural systems of ideas and feelings, norms and values, which inform the way people, think about languages 人びとの言語に関する考え方に影響を与える文化システムであり、観念や感情、規範や価値観から構成される --- ... and which "construct modes of inclusion and exclusion" (Darvin & Norton, 2015, p. 43):
"language hierarchy" - the ideology that language is fixed and that there is one correct way to use language
"language purism" - the ideology that one variety of language is more pure or has greater value than other varieties
"mother tongue ideology" - the ideology that people have only one language that they learn first and that their first language never changes
"one nation, one language ideology" - the ideology that monolingualism or the use of one single common language is important for social harmony and national unity within a nation-state
"standard language ideology" - the belief that language is fixed and that there is one correct variety and way of using a language
Reference
Darvin, R., & Norton, B. (2015). Identity and a model of investment in applied linguistics. Annual Review of Applied Linguistics, 35, 36–56.