If someone offers me fabric...
I try to figure out if they hope to see it turned into something OR if they just want to pass it on.
Generally, they just want it gone from their house. So, I say "thank you, if I can't find a use for it, I know people that can." That way, I'm not committing to me actually using it. AND, I do find people that want/need it.
As for the "it looks professional"... I would take that as a compliment and leave it at that.