You are right it wasn't banter - just puzzlement at how you can say you have no interest in something if you don't know anything about it. I can understand that you might say I'm not watching a detective series because I don't like detective shows. (That will mean you miss out on some of the best acting and writing on UK TV at the moment, but based on your prejudice against them I can see that - I do the same with anything with David Jason in) - but the blanket 'I know what I like' just sounds like an unwillingness to explore other options in life. This attitude doesn't only apply to TV for some people. It applies to food, travel, music, etc.
It's an attitude I don't understand as it seems to me that it is the product of a mind that is closed to new experiences a risk averse mentality if you like.
Look so what I see a lot of things differently to you and others, it isn't a problem for me. I dislike music, I never have liked it, people can't understand that either, including my husband, but it doesn't worry me in the slightest. I have always been different to many others, and it suits me to be so. No doubt that is why I hooked up with my husband because he was different to other boys, probably as I have said before because we now think he has Asperger's syndrome. Oh and before you ask, I did the test for the condition myself, but apparently I definitely haven't got it. As I mentioned before, my mother was always asking where she went wrong with me, as I didn't comply with her expectations, like wanting to dress in the pretty clothes she insisted on me wearing as a child, YUCK!!!! I didn't bother to attend the old bat's funeral, she would have probably sat up in her coffin and demanded to know why I was wearing trousers in church, a criminal offence in her eyes!
OK so I am weird, but I wouldn't be me if I was any other way.