The belief that women in general should be wary of men in general is NOT feminism, it has been taught for a loooonnnnggg time.
Feminism actually says "it's fucked up that we're taught to be afraid of men" and aims to make a society where that isn't the case. Both men and women want this, as we've talked about in this thread.
Step one of that is acknowledging why we're in the current situation. It's understanding that women being afraid of men isn't women's fault, it's society's. It's the fact that too many men have been raised in a way that they make women feel unsafe.
Step two is examining what society is doing to make things this way. It points out problematic undercurrents in what we teach society, and how those teachings result in people who behave poorly. This isn't demonizing all men, it's demonizing behavior and beliefs that SOME (I'd even say many) men have.
Step three is replacing those problematic views with better ones. It's changing social pressure on women AND men. It's letting women not feel obligated to be pretty all the time. It's valuing men who don't conform to the 6'5" macho man stereotype. It's dropping toxic definitions of success and how men and women behave. It's expecting everyone to be kind and value each other's emotions.
Also, agree that it'd be annoying to be approached by mostly unattractive guys, but the main problem isn't getting approached, it's the mental load of needing suddenly manage another person's emotions. If every unattractive guy came up, took a "no" in stride, and moved on, women would be way, WAY more open to men approaching them.