For people in homosexual relationships or have been(and only those people)

How do you feel when people use the term "alternate lifestyle". My brother is engaged to a man and my aunt was saying "Just know as a Christian women I wholeheartedly support your umm... Alternate lifestyle..". And my brother said "Jesus just say GAY! Gay isn't a bad word!" Now I've never had an issue with gay people. I honestly never knew there was an issue until I hit middle school. My parents always talked about it nonchalantly. But now that I am more aware of their oppression and my brother is openly gay I want to be a better ally. So I just wanted opinions.