Here's what you're missing:

A) it's much less about whether the bear is a bigger threat and much more about how fucking awful men must treat women for the average woman to go "hmmm... Maybe the bear, tbh?" The fact that it's even something women have to think about for more than a split second is a dramatic failure of our society. THAT is the point, and any discussion of "well you don't know about bears then..." is reply-guy shit that misses the entire point and simply serves to further solidify how blind most men are to what goes on in the day to day life of women.

B) An aggressive bear is a known quantity. Is it a threat? Obviously. But it's a threat that we understand extremely well. Like, a quick Google search will teach you everything you need to know about what to do if you see a bear. But a strange, unknown man? Who the fuck knows. They might seem perfectly pleasant and reasonable, act like your friend, and then flip the fuck out when the woman refuses to sleep with him that night in return for all that manly protection he provided during the day or whatever. THAT is why women pick the bear: a known problem is often preferable to uncertainty that could lead to being extremely vulnerable against a really smart attacker.

Remember, the question wasn't "would you rather be in a locked room with a bear or a man?" It was "would you rather be stuck on an island with a strange bear or a strange man?"

And to your final question, why can't we just respect other humans? Great fucking question, but the misogynists should be the ones facing that inquiry, not the people on the internet trying to point you towards them. It may be more uncomfortable and even dangerous to confront them, but don't take the easy way out by asking victims and their allies to be "nicer" instead