My heart really goes to you, onesister.
I am normally a bit of a lurker, but I just wanted to send some good thoughts your way.
Even if people have good intentions, where you are at now you are allowed to be offended. It is also good to have someone or something to be angry about/at when you are experiencing loss, and very natural.
It is a strange ting, all this traditions, one notices when losses occurs.
My fiance passéd away on new years eve six years a go. It was totally unexpected and caused by an aneurism in his brain. Our daughter was three weeks old at the time, so his death timing was mildly put not good (he was in general not good with timing anyway, so I guess it did kind of fit. But he was very good at all the rest :) ).
But people around me, both close an distant friends, all had really big trouble of what to dowith me on new years eve! Or birthdays, christmas, bumping into me on the street for that sake, you name it. I was awkward. Both their conventional greetings and some peoples lack of conventional greetings (or lack of contact at all) made me fuming inside. It all felt so fake and meaningless, and sometimes like they almost were mocking me, and I had to sit there and nod and smile and say thank you, wish them a happy new year as well, even if I felt sick by the thought of the future.
Time had passed and now people seems to have forgot all about it, and don't treat me awkward anymore.
Thinking of it it might be the awkwardness that makes you react.
I think people don't know what to do or how to react because we have turned death into something taboo and in some ways NOT a part of life (except death of grandparents, then you sometimes are not allowed to greave because "they were so old, anyway")
Encounters whit that kind of baggage is still not easy, and new situations brings new challenges.
Now I feel sorry for all the people feeling helpless and scared when meeting me at the time. I even laugh about some situations, even though laughter and crying still are very closely knitted together. I am not angry anymore,
But that has taken some years and can only happened because I got solid ground under my feet again.
I don't know why I´m telling you my story, but you really touched a spot and I just wish I could do something to really help you.
But be angry, find those people you can rely on, and preferably a place where you actually can scream and shout.
Wish you all good, and all the best to you!
(Sorry about grammar/spelling, my english is rusty!)