Not being included at work events/functions.
And not on purpose mind you, but by age. The younger people flock together and do things, talk, laugh and so on and I am on the outside of it. I used to be in the younger group but as things happen, I'm not included.
Case in point: Three of my coworkers were talking and one of them is turning 33. To which the other two said, "Man, you are getting old." To which I turned around and said, "With all due respect, **** off." Yes, they laughed but it was a bit of blow to the ego......