@Mentalray
Hmmm yeah I do get you.
I would ask someone 2 or 3 times tops if they want to meet for coffee and to let me know when it's convenient for them, and if we can find a mutually convenient time. If they kept saying 'mmm, I will let you know' and never did, then I would take the hint - they want to remain on friendly terms, but don't want to 'socialise.'
To be honest, I have done this to people too (who I think are OK, but have no desire to socialise with.) EG, I have had someone say 'we will have to fix a time to go for a meal,' or sometimes they will say we should meet for a coffee or they try to get for a visit to our house or something.
If I don't want to, (and just want to remain on friendly terms but not to socialise with them,) I just say 'bit busy for a while sorry, will have to take a raincheck,' in the hope they stop asking. They normally do. As do I if someone does the same to me.
So yeah, I have had it done to me (been rebuffed,) and I have done it to others. Sometimes people just don't want to socialise. I have had occasions when people in my life (who I see fairly regularly,) keep pushing to come to my house, or for me to go there, or for us to go for a meal, and I don't want to, because I see them several times a months anyway (or more in a few cases.)
So I don't know why they want to go out to socialise (for a meal or to the pub or for a coffee!) I only do this with people I don't see very often, or people I really want to spend a lot of time with. (like my DH, my 3 best friends, and my kids and their partners.)
IME, if someone wants to socialise with you, they will fix up a time a place pretty sharpish. They won't keep putting you off. So if they DO keep putting you off; take the hint. And don't take it personally. They probably think you're OK and like you, but just don't want to socialise with you. Like me, they are probably very selective with who they spend their free time with.