Hrmmm. This may be simplistic of me, but would it help if he had a way to play on the computer and yet also be physically near you? I know it helps us that I have my iPad now -- I can snuggle up with Optimus or hang out in the playroom with the kids and I'm still much more available that way. I can hold up my end of a conversation, pause to show him funny stuff I find online, etc.
It probably also helps that our computer is in the main living space. It's not the same as vanishing into a basement or man-cave or whatever.
I'm sympathetic. No, you shouldn't be obliged to make a big demo of how upset you are before an issue gets attention. But hopefully it helped/worked? Did he seem to get it at all?