The original poster is saying "somehow in my head HN posters appear as male". That doesn't really mean the poster is assuming that HN is actually 100% male. It'

The original poster is saying "somehow in my head HN posters appear as male". That doesn't really mean the poster is assuming that HN is actually 100% male. It's a description of his or her imaginative process, which is a matter of great psychological and sociological complexity.