One more thing... wind is VERY different on the ground and at 100', 200', 300', etc. When I started flying full size, i remember how i had to get the winds at 3000', 6000' and 9000' to pick the one closest to a tail wind. And at those different altitudes, the wind blew so much different in direction and speed.

Just climb to the top of a 10 story building and see how the wind blows compared to the ground.

As far as the LHS, find another one or if you have any questions, talk to someone else (here's the perfect place). And your instructor seems like he just doesn't want to put any effort into teaching you.