Preaching anything is bad.
Neither is bad. And it's no one's place to preach to anyone for being What they were born with.......gay or straight!
People don't wake up one day and choose to be straight, they either are or there not. So in my humble opinion, people who are gay, are born that way as well as people who are heterosexual. .
Preaching? About what?
Depends on what 'preaching' entails, I suppose. That's way too loaded a word to give any clear answer.
But...probably, I suppose.