You need to respect all bears. A 100 lb yearly could cause you serious harm if it was intent on attacking you. Give them space. Learn the behavioral signs that they might be aggressive toward you.
I do love bear threads!
Never had any serious problems with bear encounters and for the most part they high tail it when they detect a human. There are exceptions and those are the bears you pay close attention to. Studies have shown that young male black bears are the more prone to aggressive behavior toward humans.