Not mean. You followed sandi's rules. You don't acknowledge birthdays, Mother's Day, Christmas or any of that stuff. She fired you as her H remember? You should do something on behalf of the kids. That's a given but it's from the kids and not you. My ExW's birthday is soon as is mine and I will get a gift from S10 to her and that's it. I also know she won't acknowledge my birthday either. So be it. Your doing the right thing.
Me:43 Her:42 M:14 S:9 EA started 2014/03 (or there abouts) PA started 2014/05/30 BD:2014/11/05 I left 2015/10/01 I returned 2015/05/02 She left 2015/06/10 OM still on the go.