I’d like to believe that dolphins and whales don’t judge all of us on the behaviors of some of us. You can find plenty of videos of cetaceans in some sort of anthropogenic trouble–usually being bound up in plastic trash we’ve left in their habitat–approaching humans as if they hope we might be able to help. And of course there are stories of dolphins rescuing humans foundering at sea, helping them to shore or boats.
And if they know we come from boats, they must know that some of us are dangerous.
Some of us are dangerous: to dolphins, and to ourselves. But most of us are OK. You can’t tell from the outside, though.
Probably, dolphins aren’t bigoted. You never hear about dolphins attacking humans, and there are certainly times when they would have cause to hold a grudge or feel that they might have to defend themselves.
Anyway, you can’t judge all of us by the actions of some of us, or even a large group of us. You sort of have assess us on a one by one basis, because we’re all individuals. At least, we should be.