YABVU to suggest it's wrong to message at whatever time of night, but it would be wrong to call unless it's an emergency.
Maybe it's generational, but being older, I view texts the same as emails - or voice messages. It's up to me when I listen to them and respond. I turn my media sound down every evening to avoid being disturbed and I assume others do the same. People will phone in an emergency - not text.
My DD is horrified if I leave people unread (if I read their message and don't reply immediately). To younger people it's considered very rude (apparently). I can't get my head around this, as maybe I'm too busy to reply when I read it, but want to just see what the person wants. If it's just a friendly text about meeting up, and I'm busy, then I'll respond later. If it's a friend saying they were very depressed or that something bad had happened, then I'd drop everything and respond there and then, even if it's just to say I'm on my way to work, will text them asap and offer some brief but caring response in the short term until I can speak to them properly. Then I'd call them the second I left work, for example, not text.
People allow their phones to control them way too much these days. Answer if you want - if it's inconvenient, don't - they'll call back. If you don't want to be disturbed by messages but want to keep your phone on for potential emergency calls, then adjust settings accordingly. It's not hard.
As to the rest, well, not sure what to make of him. He seems a bit intense like others've said.