You need to understand something -- if Jesus didn't say something, then all you need is the Old Testament. The assumption is that Jesus accepts all of it ("not a tittle or a jot of the law shall pass away"), which of course he does not.We should ask this preacher, ?Where in the Bible does Jesus Christ Himself condemn homosexuals? The fact that nowhere in the Bible does Jesus Christ condemn homosexuality should hopefully persuade this preacher to refrain from narrating hate speech against homosexuality.
The trick is quite simple really -- don't admit you've ever heard of the NT when quoting the OT, and vice versa.