Well, there are lots of reasons for flunking an online meeting. I personally often forget about them. Doesn't matter that I only talk to my real friends too who're most important to me. Just how I forget about... everything. I wanted to be offline, reading right now actually... Doesn't have AD(H)D that friend of yours, does he? If he constantly says he'll do things but doesn't do them. Either that or he's a busy person. Or he might not be taking what he says particularly seriously/serious enough.
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Autism + ADHD
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The trouble with having an open mind, of course, is that people will insist on coming along and trying to put things in it. Terry Pratchett