Wee Ali,
That's sometimes true, but perhaps your first sentence should just read "Some guys are just crap at teaching." It does appear to happen more often to women, but I suspect that's because we're more willing to talk about it. I've met guys who've had similar problems; one phoned me and said he was giving up flying (he knew I'd had similar problems so was happy to talk to me), another was told by the CFI he'd never make a pilot but went to another flying school and had his PPL, IMC, and night rating last time I ran into him. These guys shouldn't be instructing. It's the system that needs changing.