Alan Wong responded to the question, "what is it like to be rich?" in a comment that he initially thought only the person who asked would read. This response can be found in the timestamp range from 00:13:02 to 00:13:13.

Here is the sequence of events as captured in the provided excerpts:

1. Alan was asked, "what's it like to be rich?" (00:13:02).
2. He wrote out an essay-like comment in response (00:13:06).
3. This comment unexpectedly went viral (00:13:13).

Thus, Alan Wong's response to the question about what it's like to be rich is discussed in the segment from 00:13:02 to 00:13:13.