To be annoyed by people who say 'feel free to come over any time this weekend'

[Plippity]

Because it puts the onus on me to sort out a plan. I have one particularly friend who does this frequently. She lives about 40 minutes away in a place that i' m never just passing. She definitely doesn't spend her whole weekend sitting in the house, so if I did just drop by she may not be in. And she spends a lot of time in her huge garden, without her phone and where she can't hear the doorbell, so again if I did just drop by I might end up having to climb over her back fence to get her attention. So what actually happens is I end up having to do all the work to arrange a convenient time to go round.

Maybe my AIBU should have been to be annoyed with people who say come over anytime at the weekend but don't actually mean anytime.

In that case no, YANBU because it's misleading. I guess it would depend on the friendship. If that was just their nature and they're not meaning to make you do all the planning then I'd let it go and be prepared.

If it was someone who somehow thought their time was more valuable than mine or just never made any effort to organise themselves then maybe I would get a bit annoyed after a while.

I suppose it depends on their expectations of me.

@Plippity

For those of you saying, just name your time, I see your point but it's never usually that easy. I say, ok see you at 2 on Saturday and it turns out she isn't free then or I text and say I'll be over in an hour and get a reply that she's just about to go to x and not sure if she'll be back. As wannabemathematician says, it's the extra mental load.

The problem isn't that she says come over any time. The problem is that she isn't willing to inconvenient herself for you whatsoever. So she's not really a friend.

Friends and I might well do this eg

Friend: "What are you doing this weekend? Do you want to get together?"
Me: "We're free all weekend, why don't you come over here at some point?"
Friend: "Okay, that sounds great. What about Saturday afternoon for tea?"
Me: "Sounds great, see you then."

Or
Me: "Do you want to come over this weekend for a BBQ? What day would work for you? We're totally flexible?"
Friend: Sunday late lunch?
Me: Great.

See the difference here - I might be letting friend suggest a time, but that's in a normal give and take. Your friend is not doing that.

I know a couple of these people, I love them dearly but yes so annoying. They think they are being welcoming and they don’t want to be rude by dictating a time .... but when you try and organise a time it turns out they have said the same to a number of others and so they aren’t actually free at all.

You are seriously over thinking this and making it into a bigger deal than it is.
If you suggest a time and she isn't free then just suggest another. Do you seriously worry so much about things like this?