Right, just because you're aware of the error doesn't mean you're not still in error. At some level, you're assuming whore woman.
The phrase "whore" is most commonly used as a pejorative directed at women (as it was in this case) who are having (as defined by the person using the phrase) too much sex. It is almost never dirceted at men, because very many people have double standards about sex when it comes to men and women.
Next time, I'll just assume you're unfairly characterizing another person.
Anyone using "whore" is an insult is at best a puritan. Unless they use similar things for men as well, they're also a sexist puritan. There's a very high chance that the person is a sexist puritan, because puritanical attitudes usually come with all sorts of fucked up assumptions about sex and those fucked up attitudes while by no means exclusively sexist, contain a fair dose of sexism.
So yes: if someone uses the insult "whore" it does indeed tell me a fair amount about the person. Certainly enough for me to characterize some aspects.