I am a woman who reads mysteries. I would be the first to admit I don't know much about guns or standard police procedures so it's entirely possible there could be errors I wouldn't notice.
However, if there are errors on topics I am familiar with - there's no way the character could drive from Town A to Town B in an hour, or the main character is driving a car like mine but in a color that was never available in real life, this does bug me. This kind of error is especially annoying in books written in recent times when the author could have quickly and easily checked these things online.
I do avoid what I consider "silly cozies" where the protagonist is a woman who owns a food- or craft-related business while somehow managing to solve all the local murders. That whole concept seems like a big error to me
