Bad online reviews are not the end of the world. In fact, customers expect to see a mix of positive and negative reviews on your Yelp page--or else they'll get suspicious. Even so, unjustified bad reviews from cranky customers, disgruntled former employees, or even ruthless competitors, can happen.
But you don't have to sit back and take it. There are ways to actively manage your page without meddling too much. For example, when it comes to handling a fraudulent review, you should respond publicly and politely one time and then ignore the reviewer from then on.