Out of town where metallic noises aren't normal, it sure puts their attention on a person who is acting agressively, so it seems to work well. With people who stand quietly too many times the bear moves in to check them out and ends up getting shot when they get scared, even though its intentions may have been innocent curiousity.
But bears are territorial and some get pushed into areas with lots of noise. We had one black at our 200M pistol range which stood at the end of the right bank of pigs while I was dropping targets on the left bank with a supermag moving toward it. Luckily I noticed too many targets (shooting from creedmoor) before any bullet spatter could hit it. Javelina are at 100 metres so why neither the sound of the gun nor the huge clang of the bullets knocking down targets bothered it, puzzles me still. But those were the days when bears habituated to people and noise were trapped in town and moved to places where they might make a living in territory that normal bears wouldn't want. We've had bears move onto the range while 4 shooters, shooting everything up to 30-30 pistol were dropping targets.
When my grandson was 8 he came to stay with me for a few weeks of shooting and salmon fishing. We were out at the (then terribly brushed in) rifle range with me focusing on him being safe while shooting my old Marlin .22, and getting some video, when a young griz moved out from the left despite the noise. That bear too was occupying the noisiest and least desirable territory - and so was habituated to noise, and at that point my grandson was just interested in shooting lots. The bear was fine about things since I noticed him before any problems arose, but the video didn't go down too well with my son.
Now bears in town are trapped and shot, so out of town the rest mostly act normal.
Mostly both grizzly and blacks here are well behaved and encounters are just due to large numbers moving down on to the same streams we are trying to fish, moving into town, or when they drop in for a snack:
https://www.youtube.com/watch?v=GjrI5ELkj3Y
https://www.youtube.com/watch?v=WhydrS8LUUI
Any Youtube search on Kitimat bears will find lots of close ups.
If a bear is wounded from a recent territory fight, is sitting on a pile of meat or gutpile, or defending young then everything changes. Same thing if you run from a black as my ex-wife found out when she walked down to a creek ahead of me. That ended fast when she ran past me and I didn't run - but even then I didn't need to shoot the bear which quickly changed its mind about things. Bears really pick up on aggression.
In Hyder there were and probably still are bear platforms where you walk by bears and stand on a platform for better pics. The bears could easily snag any tourist, but seem tame. Well one griz did eat a camper a few years ago in Stewart just down the road... Here things in normal circumstances are not as casual but with few attacks given the sheer numbers. In the Bella Coola valley the grizzly bears are highly aggressive. A guy named Timothy Treadwell used to pet bears at Katmai - my guess is that a new bear moved in which didn't like petting so it ate him and his girlfriend. Same sort of thing would account for the bear in Stewart killing the camper.