If you are the the airplane and find the person sitting next to you
paid half what you paid, what are you going to do?
If you buy a car and then find out your neighbor paid $1000 less
for the same car, what are you going to do?
There is no discrimination here, only ignorance. You can talk to
the builder and he may give you something out of good well.
Don't call everything discrimination. You are doing a disservice to
the true fight against discrimination.