Do you think spiders know that some people find them to be utterly terrifying?
It sure seems like it, since they love to appear out of nowhere when those timid souls are just sitting there minding their own business and hoping not to see a spider.
But if spiders are aware of how terrifying they are they're not letting on, and as this The Odd 1s Out comic shows they're grossly underestimating what humans consider an appropriate level of threat response.