Why yes, the Bible does say that male-to-male buttsex practitioners ought to be put to death. However, according to the rather horrifying legal code expressed in Leviticus, practically everyone ought to be put to death. This was swiftly pointed out to him:
But I fear that it didn't do too much good. Believing that millions of people ought to be killed--let alone for the spurious reason offered here--is really not the sort of thing that one can be argued out of. Which is to say that if the thought of committing a crime that exceeds the Holocaust by at least an order of magnitude does not dissuade you from your position, then rational debate is unlikely to, either.
But it does raise an interesting point: the verse in question clearly says that male-to-male buttsex practitioners ought to be put to death. That is undeniably what is actually written, right there in black and white for the world to see:
If a man also lie with mankind, as he lieth with a woman, both of them have committed an abomination: they shall surely be put to death; their blood shall be upon them.One last time so that we're absolutely clear: according to this verse, those who commit male to male sex acts should be killed. No exceptions, no wrangling, no ambiguity, that is what it says.
So here's a question for anyone who likes to quote the verse against gays: do you believe that everyone who commits male to male sex acts ought to be killed?
If you do, then you're advocating genocide.
If you don't, then your beliefs stand in direct contradiction to what the verse clearly and unambiguously says.
That being the case, you should probably stop quoting it.