From the other side of the aisle, consider receiving a dozen messages that just say "hi" and a handful that are legitimate attempts at conversation. You only have so much time in a day to respond, so which ones would you most likely respond to?

In my experience of 2+ decades of dating across the gender spectrum (much of which was initiated online), the people who message "hi" often end up being bad conversationalists. I put effort into responses, just to get back something like "lol, that's great. wut u up to saturday?" Uh, probably looking for someone who'll respond as if they read what I wrote before attempting to meet me in person.

Though I'm the kind of person who likes deep conversations, and I know not everyone is. I make it very clear in my profiles that we need to both feel a connection, so I expect someone who messages me to at least comment on one thing I wrote. Some people don't bother at all, just going by pictures and spamming "hi" to whoever is attractive to them, without reading a word the person wrote.

Anyway, I think the point is that a lot of people don't put in the effort, whether man, woman, or nonbinary. People treat dating sites like it's a shopping website and they can just put people into their "cart," like we're just commodities that can be freely exchanged. If someone just says "hi" and nothing else, I assume that's the way they see me. I see no point in responding if the entire burden of conversation is going to fall onto my shoulders.