The average cell in our bodies is about 50 micrometers. A micrometer = 10^(-6) meters. A nano meter is much smaller at 10^(-9) meters.
From wikipedia:
"Nanotechnology refers broadly to a field of applied science and technology whose unifying theme is the control of matter on the atomic and molecular scale, generally 100 nanometers or smaller, and the fabrication of devices with critical dimensions that lie within that size range."
100 nanometers is still smaller than 1 micrometer. Nanotechnology is about making things as small as possible. The smallest atom Helium is approximately 1 angstrom which is 0.1 nm.
Yes, if humans were 100 times larger then my computer mouse would be very small, but the size of nanotechnology is a constant. I do not think it is a relative thing. Plus, if my mouse is on the base scale (meter technology) and if I were 100 times larger and if the technology size was relative then wouldn't the mouse be centimeter technology?