If you had a few friends around to your house for drinks and food, would you do the dishes whilst they were there?
So once everyone had finished their food, and were chatting over drinks (no time limits, everyone expecting a late one), would you disappear off to the kitchen to wash all of the dishes, or would you leave them stacked up in the sink and deal with them the next day, and concentrate on hosting?
YABU - I would do the dishes there and then
YANBU - I would place them out of the way in the sink and leave them until my guests had gone/the next morning