Hey, that's not fair. We all engage with other people's ideas all the time, no one is really a unique thinker. The best model I have for intellectual activity is that it's a multiple-millennia-long conversation between people over generations.
The main thing is that it's important to acknowledge who it is that you're replying to and to be very clear about to what degree you're synthesizing their thoughts versus contributing your own. But we're all derivative thinkers in the end, even those of us who get famous for original thinking.
If someone is going to expound on unique thought, I’d hope they live in a cave in the woods making unique cave drawings with their feces or riding a pale green elephant wearing magnetic boots upside down within a large refrigerator.
If you want to really be a unique thinker, sure you can listen, and aggregate, summarize, but don’t regurgitate.
The main thing is that it's important to acknowledge who it is that you're replying to and to be very clear about to what degree you're synthesizing their thoughts versus contributing your own. But we're all derivative thinkers in the end, even those of us who get famous for original thinking.