So you the person that PG is describing. Someone who feels that some things must not be said, even if they might be true, because of the outcomes that might result if we say them.
My position is mainly that unethical things shouldn't be advocated for. I think there's no good argument for stopping trans people for living the lives they want to live, and that people will rightly criticise you for being opposed to them exercising their freedoms. It's not that these things "can't be said" but don't be surprised if people criticise you for it. I think people calling this heresy are being melodramatic - being ratio'd on twitter is not the same thing as being burned alive at the stake.