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Depends on what you mean by "bad."
Most girls have some odor even if they are healthy. And sometimes it's stronger than other times, probably having to do at least in part with her monthly cycle.
To some guys a woman's natural odor down there is a turnoff. So they don't like giving oral sex.
To other guys it's a turn ON.
But sometimes other things are going on in a woman's system. There are a lot of things that go on down there. And sometimes the odor is different, maybe even indicating an imbalance or an infection or hormone changes, or her period... and it can be very unpleasant.
So yes, of course if a guy doesn't like the odor or taste he's not going to enjoy giving oral.
PS: Women smell different. Each has their own individual natural odor. It can be a real turn ON. It can kind of smell bad and good at the same time... but also sexually arousing.
I won't do it. There are plenty of ways to have a good scent if your body fights against it. Yes girls, you can tell if it's bad smelling and tasty down there, the same way we can. If it is, you can do something about it. I went down on a girl once that smelled so foul, I immediately got up and said "sorry, I can't do it. I just can't. I'll fuck you, but oral is out of the question". So definitely NO... I won't do it if she stinks, and believe me, I'm a guy who loves body scents, so it has to be pretty darn bad for me to leave it alone.