IN short it depends on the woman in question. I do not believe body type has anything to do with they whether support or deride Feminism. Now a number of woman are likely to get pissed off by questions like this.
Now the fat ones as you described them are likely to be really pissed off. Are some of them feminists, I would think so. Statistical distribution in any data set would tend to suggest this
“Better a true enemy than a false friend.”