That is really horrible behavior for people who are actually adults and can't use the excuse that they're still teenagers. They're the ones being spiteful, not you. I don't know if it's easier said than done but if it was my husband and I, we just wouldn't bother with them anymore. They can't even hide behind the excuse of being flaky or something like that. They are just immature and mean. We've lost a few friends after losing our daughter, some of the friendships just dwindled after they may no effort to reach out to us and a couple I consciously rid myself of after some unthoughtful behavior. That said, that particular couple I have 'let' back in the past year (ie Facebook friends). Sorry I'm kind of rambling.... I guess I'm trying to say that I think it's really normal for friendships to die through one party going through grief but then grief causes other friendships to blossom. It sucks sometimes but I think in this case you may feel better if you actually let this these friendships dwindle right now, it will save you a lot of anger and hurt and you can put that energy towards more positive parts of your life and will probably find that there's other people in your life that are much more positive influences and enjoyable to be around.
Be gentle to yourselves this week and know so many of us think of you and Angus. X