How do you answer them? Specially questions about "Haram Chicken".
I my early twenties (4-5 years back), I used to actively engage with them on merit. I used to ask them what makes a chicken "Haram". Is it not taking the God's name when slaughtering or is it the non-Islamic way of slaughtering?
Some answered it was God's name and then I would ask them how strange it is that not saying a verbal thing, physically changes a food item into being unfit for consumption. Some people didn't have any answer, but others gave silly answers of 'just because'. Only uncle said, "Since one dirty thought during Hajj can destroy your whole Hajj, thereby losing you your PK Rs. 350,000 - just like that not taking one God's name at the point of slaughter can lose you your 8 chicken - Islam is very fair, Allah'u Akbar".
Other's answered me that the non-Islamic way of slaughtering was unhygienic. I then conducted a little research with British Meat Association about the blood draining procedure of slaughtered birds. I could not find any unhygienic practices in there which were unfit for human consumption. I just couldn't believe that in a developed Western world, where mostly everything has systems and procedures working for human and animal care, how could they go out of the way to make unhygienic practices for human consumption. I realized that these were all just stories that hard-lined Muslims told me.
So after that, I understood this game of 'Haram' chicken.
Now to your question: How do I answer them?
My answer is that: After talking to hard-lined Muslim people over a range of topics and being brought up as one and being a 'normal person' now, I've realized to never to try to change anyone or convince anyone on any matters of religion. So, all my efforts are only to understand the truth. Like in the case of Haram Chicken, all I wanted to know was what made it Haram. My intentions are never to change anyone's beliefs, because frankly I know that one can't change a grownup hard-liner. One must live with them, in life, just like one lives with everything else in life.
So when someone tells me, "I don't eat Haram chicken", I say, "Good for you for telling me that". When they cross the line of mannerism (
like recently Ahmed Shehzad did with Dilshan) and tell me that I will burn in fire for eating Haram Chicken, I still tell them, "Good for you for telling me that, now move along".