Not sure why ‘Love the sinner, hate the sin’ is considered bigotry — unless of course, you don’t actually LOVE THE SINNER. I’m a black, African — Kenyan to be precise), Male, Conservative, Christian. Not an LGBT ally but a friend to some lesbians and gay people. Hope that does not make me a bigot.
As for your point, I agree with you like 100%. The ad advocates for people to get to know each other before coming at each other with beliefs. Like someone else said here, it’s hard to hate people once you know them — this ad does a good job of showing that. I think the writer is mistaken in this regard. The title of the article doesn’t help either.