[sanxiyn]

> If we assume that there are no racial differences in technical ability, then the demographics of my office should roughly mirror the demographics of the surrounding community.

This is a big assumption. It may be true, but you are asserting it without evidence. Demographics of NBA do not mirror demographics of USA.

[sgift]

It's the reasonable default assumption as long as you have no evidence for the opposite (i.e. that white people have racial attributes making them better at tech / non-white people have racial attributes making them worse). Can you provide evidence for the opposite?

[kgabis]

You're the one making the assumption so you should back it up with some evidence (burden of proof).