I handed in my notice nearly 2 months ago in a 1:1 with my manager. They were sympathetic and sounded sad but then ended the call early as they said they needed to start the process of telling people and that 'a lot of people will be disappointed'.
Since then I haven't really spoken to my manager. In a meeting when my colleague brought up me leaving and how they were sad I was going they said something like 'it's ok, we've got X and Y to replace her. She's good, but not irreplaceable!' in a joking kind of way but I still felt it was a bit rude.
The head of my department also hasn't reach out or spoken to me, even though my manager said they would be in touch.
I just feel a bit shit about it all to be honest. I'm leaving next week and have to go into the office on my last day to hand everything over, and it will be a Friday on a day with train strikes so the office will be completely empty.