What is changing our minds regarding Homosexual rights?

Nothing is perfect, I am aware people who happen to be homosexual have a lot of problems still.

They seem to have made significant gains within my lifetime, however, in attaining certain civil rights and to be gaining in cultural acceptance.

Why am I more accepting than my father or grandfather? What actions have moved the needle?

Is it because persons I know and respect have come out to me? Were their actions undertaken by activists to bring about a cultural change of mind?