Why do some people hate Dan Savage?

I was just having a lot of time on my hands as usual one day on the Internet and came across his view of monogamy on the youtube channel BigThink. I had never heard of Dan Savage before, but most of what he said about society’s unrealistic views of monogamy I had agreed with long ago.

However, I realized that a lot of my friends hated him. I looked him up and couldn’t understand why. I want to find out why, because the wiki doesn’t really indicate why. I don’t know what he has done or said, and was just confused because he’s a liberal pro-gay guy and yet most of my liberal pro-gay friends still hate him.

I only managed to come across an incident of him being glitter bombed for being a “transphobe” as well as “racist and misogynist and a rape-apologist”

I want to know more the things he has said that has made him been labeled as such.