Excluding people from events they'd enjoy is rude.
Tomas and Andy are friends and both are avid hikers, but Tomas recently moved to another city.
Andy wants to go hiking.
Andy plans a hiking trip to a national park and asks Andy if he is available to go with them.
Andy plans a hiking trip to a national park and invites all his friends, except for Tomas.
Tomas makes time in his schedule to go hiking with Andy, and the two remain close friends.
Tomas feels left out and his friendship with Andy becomes strained.