Interestingly, after having graded 'mainstreaming' as disagree, I came across this source, which refers to gender mainstreaming:
https://www.unwomen.org/en/how-we-work/un-system-coordinatio... My initial comment still applies, that normalization and mainstreaming have distinct connotations, with mainstream favoring 'prevalent attitudes' and normalization aiming to eliminate the perception of any behavior/identity as 'abnormal.'
However, the term does seem to be used somewhat synonymously with respect to equality. My question would be whether equality and normalization as a means of combatting the notion that some identities are abnormal are the same thing.
Thanks for your question William - it's an interesting and highly relevant conversation.