In response, I was told that my understanding of philosophy is like that of a 20 year old and that I am intellectually stuck in the 1800s (in a comment comically premised on the moral philosophy of the ancient greeks).
I do not see my comment as a put-down at all and it certainly is not anything like that response. Nonetheless, I will take your feedback into account - clearly it came across to multiple people as condescending.