My (very limited...) bear experience: black bears are pretty shy and avoid humans EXCEPT if they are accustomed to humans and human food, if cornered without an escape route, or if with cubs. The closest I ever came to a wild black bear was on a road bike ride, climbing to Lake Desolation in Saratoga County, NY. As I rounded the last major turn at the top of the climb early on a summer morning, a black bear ambled across the road a few feet in front of me. They casually looked over the skinny cyclist and decided that I was not a worthy meal. They then continued to mosey across the road and into the woods. As the adrenaline pumped into my body, I went from "fried from the climb" to "I'm ready to sprint!" instantly.
As for grizzlies, I hope to never meet one up close and personal. A group of cyclists in Glacier NP ran into one Sunday, thankfully with no harm to bear or cyclists:
https://cowboystatedaily.com/2022/05...yone-survives/
Greg