No. They can’t.
You can only preach if you are espousing the liberal view of some issue. So you can preach that you are in favor of homosexuality and homosexual marriage, but not in opposition.
Ditto any other issue, such as global warming. We are allowed to preach about the dangers of global warming and saving the polar bears, but are now allowed to preach in opposition to the hysteria we hear on that subject.
For as long as they are treated as kings.
It’s time to stop treating them as kings. They’ll be horrified, but they will soon realize their bluff has gotten called.