It's not very generous, but actually plausible. Maybe your memory doesn't mix up objects (?), but other people's memories certainly does. (There is even a verb

It's not very generous, but actually plausible. Maybe your memory doesn't mix up objects (?), but other people's memories certainly does. (There is even a verb for it: mix up.) HN and reddit are basically the same, and it is very plausible that they got mixed up, and the rest is just derived.