Ajay, you're relatively new here. Aup and Paar both have over 10 000 posts, so they've been at this for quite awhile. Some of us other 'oldies' have read a lot of their words over substantial time, and have seen many repeat performances.
So you're not privy to all of that history, unless you're done a tonne of reading. I understand where you're coming from as perhaps I was once there myself. But if you try to explain something to somebody, watch others try to do the same, many many times, and you see no shift, there may be a tendency to let your frustration out occasionally. That is the nature of human discussion.
This applies to both Aup and Paar. Several others have debated Aup on about atheism and Hinduism, and several others have debated Paarsurrey about his Amadiyya lens from how he views the world. I've had the 'privilege' of watching and participating.
Not that you asked for it, but my advice would be not to waste your time. Both are inflappable in their convictions, but neither ever angers either.