You have to be more direct if you're gonna complain about this. This is how that conversations came across...
Friday?
Um, not friday...
Saturday then?
Saturday's no good either...
Some other day?
Seems like you're interested because you just rule out the next two particular days he asks about and not EVERY day for the rest of eternity. Can you see how he may have once asked out a girl who really WAS interested but really just had plans for the upcoming weekend? What if that was the case? What if you were really interested? I'm guessing your post would go something like this:
"Why are guys so freaking shy? I mean come on, just because I'm busy the first weekend you want to go out with me, doesn't mean I'm not interested. I do have a life, and other plans that I have to keep, so just keep trying and when I have a free day, then I'll go out with you. SHEESH!"
Just tell him you're not interested. It'd save a lot of time, a lot of effort, a lot of thinking, and a lot of messageboard space 🙂 Actually, this one thread could be a symbol for all the inefficiency that is messing up the economy. 🙂