It's certainly extremely likely that petty grudges and resentments, as well as plain old paranoia and fear, played a large part in accusations of witchcraft - and also, the whole 'witches were women who lived alone and made medicines with herbs' thing is hugely over-stated. Lots of married women/mothers were accused, and actually quite a lot of men too, and even children.
However, your friend is still talking absolute bollocks. Many of those who accused women of witchcraft were also women, but there's zero evidence to suggest that it was anything to do with envying the beautiful. We don't really know what the people involved really looked like, for a start, and the age range of those who were subject to witchcraft trials is pretty big, ranging from children right up to the very elderly.
At the height of the witchcraft mania, people would have been genuinely scared and looking for signs everywhere. You know how on Mumsnet someone will say something like 'My next door neighbour is a man who lives on his own and he keeps smiling at my little girl when he sees her playing on our driveway, AIBU to think this is creepy?' and dozens of people will reply 'Yeah, you can't be too careful, can you find out from the police if he's on the sex offenders register?' or 'I would not like this. Have you tried asking your daughter if he has ever touched her?' etc - well, basically like that only instead of people thinking there are paedophiles on every street corner, in those days it was witches. It was paranoia.
So, yeah, your friend is spouting misogynist crap.