What do you say to someone when they insist you to throw/give away your things you don't need.

If it was someone who shared my space, I'd discuss it with them. What I'd say otherwise, would depend upon who it was. There aren't many people who have any business [b]insisting[/b] that anyone get rid of their [b]own[/b] things, really.

I do have books I'll probably never read, or read again, and need to find another home for. I also have lots of books that I'll almost surely read again...one day.