Jealous people

[BengalsRocker]

I think what the OP is describing is the "woe is me" type co-worker.

These people think they have the worst luck and that life is just trying to crush them down.

Most of their problems are caused by bad decisions but blindly believe they are destined to be screwed... and that you are privileged and so lucky.

So yeah. I've met some jealous Eeyore asshole co-workers before in my life.

Your vacation only made them feel reinforced of their beliefs.

The other side of it... is if they had to do more work or adjust their hours because of your absence.

If that's the case then yeah they don't care nor want to acknowledge your time off.