This is horribly underrated - pure bars, my friend.

The point is that height is beyond the control of an individual, yet weight can usually be controlled. He’s calling her out for asking why he was tall (which she presumably did because she only dates taller guys, speaking from empirical and statistical data), which she seems to seem important, yet gets offended when asked how much she weighs, which is something she can control. So, yes; not quite a double-standard, but even more disappointing.