The only report that I'm aware of is the Alaskan fisherman on monster quest that saw a giant grizzly on the beach run away from a bf when it approached the beach from out of the woods nearby.
A traveling squatch would probably run into a traveling bear on a frequent basis. The result of this would be that they each avoid each other the vast majority of the time. Now if there were food involved that both wanted, there could be conflict. Even so, if a squatch wanted to drive off a bear, it could do so by pelting it with rocks and other thrown items from a safe distance. If a bear tried to drive off a squatch, the squatch could retreat to a safe distance and take the same approach, pelting it until it goes away or takes a shot to the head.
Theoretically, a squatch could actually kill a bear with a large, well-thrown rock, though I don't know of any reports where a squatch has been observed using rocks to kill things. It may be that they just don't think this way and prefer, when killing, to do it by brute force. There's some sense to this. A missed throw, or a glancing blow, may allow prey to escape, whereas closing in and killing prey hand-to-hand is a surer bet, for hunting. But to drive something that you don't want to eat away from something that you do want to protect or obtain, thrown objects should serve, unless it just simply hasn't occurred to them to throw rocks at bears. They seem to do so with humans readily and accurately enough, though.
A bear encountering a group of squatch, would probably be driven off pretty easily and a bear that realizes a group of squatch are in an area would likely avoid the area and them.
In the case where a lone bear manages to get the drop on a lone squatch, both are likely to come away in bad shape. A bear may be dumb enough to do this. I think a squatch would have to be desperate, though, to risk close contact with a bear. Even if a squatch can dispatch a bear with ease, why risk injury?
We have the advantage over squatch because we work as a big group and have superior technology. Squatch would have the advantage over bears as a small group that can cause pain at a distance (superior technology).
Bears probably learn young that squatch are painful. If I were a squatch, I'd start throwing rocks at bears every time I saw one, just to get the message across to the bear that hanging around a squatch hurts.