I tend to like the occasional stray invite to do something. Like, it was my custom until recently for me to have no plans for the weekend because my group and I had an informal system: just wing it. It usually worked out that we all failed to make plans, which I suppose is some kind of plan in and of itself.
That said, I grew up in North Carolina. I now live in Washington (the state). Things here are considerably different than they were in NC. I tend to look at it like insincerity, or perhaps some degree of patronization. In any event, in North Carolina if someone asks, “Say, grab a beer? Or coffee?” it means that they’re going to their office to grab a sweater or a jacket and then they’re ready. I like that as a nice beer after work with people is unexpected and nice to do on occasion.
Here, the same question essentially means that in three weeks after the lunar new year on Chusak with prevailing winds, maybe we’ll have time to get a cup of coffee to go during which time while waiting in line we might have a moment to bitch about how long the line is.
There are a few friends who have a reasonable expectation that if they call up and want to come over, they’ll get to. These people are rare. Of course, they’re also aware that I don’t generally encourage surprise visits so this conduct is kept to a minimum. I think that’s a good friend: they know I like advance warning (one never knows what’s going on in my home what with three children and all) so they’re respectful of that. I am equally respectful of that by frequently setting up parties.
I am, I think, free to call up and drop by their homes with the same, or very similar, set of restrictions. But none of my friends has ever said no, nor can I recall saying no to them. I’m sure it’s happened, but so rarely that it didn’t warrant remembering. I’m not a planner in that regard to obsessive amount, but I, like most other people, have a schedule with some inflexible parts. But if any of my friends called up and asked to come stay the night tomorrow, it’d be game on provided they’d understand that I still have my daily shit to do.
Of course, all of my friends have professions of their own so our times are generally limited to the weekends.
I think the key is to not be too inflexible, but still adequately firm with a friend who takes advantage of that too often.