I get the same question from some who are looking for my business -
"Hey hun - you free today?"
I always answer, WITH A LMAO or emoji
"I'm never free, but I am reasonable"
Try something light and humorous rather than show your feelings and shoot back about something that is commonly used in everyday language. I'd wager 99% of the "are you free" questions really are simply wondering about your schedule
I think the menu question was best answered many years ago on ASPD by one of my ATF providers Rumor aka Alice.
Someone had started a "who does CIM" thread and her response was
We all do, just maybe not for you
I think that could be reworded to a generic
"There's absolutely nothing I won't do for the right man - but that's something we can discuss when you see me"