Back in the 90s, California had over 10 cases of young Hmong couples taking tshuaj ntsuav nyiaj because no elder could be convinced to let their children marry other children of the same sex.
Personally, I was told by a girl who had a sister that was cohabiting with the sister's girlfriend for 8 years. Their parents didn't quite approve of that relationship, so no one married them until the sister's mother finally slaughtered a pig to bind their marriage in the Hmong way.
It's not hate; it's discomfort in adjusting to the new way of life that never existed in the Hmong culture before--that's what has made many Hmong elders reluctant and timid in going through the marriage ceremony with such couples.
Same goes for the same-clan marriages.