Jehovas Witnesses have a 'thing' about blood. They will not alow the blood of another person to enter their bodies, or their famalies. So I suppose an 'illogical'extension to that would include any other chemical produced in the human body. Why they hold this belief I dont know, nor can I understand such a mindset.
If I was you mate, the next time they call by, tell them to feck off. Cheeky sods, if they had called me an abomination, they would finish the conversation round my fist.
Arrogant pigs.