Like, I might if the ad is relevant to the piece of content in question. For example if I am watching construction/woodworking/industrial videos on youtube I won't be surprised if I see ads relating to tools, but thats about it.
I'm not gonna go ahead and buy this tool specifically because the ad is on a video I enjoyed, or associate another company with evil just because it's on a bad video.
Another guess would be it's simply the subconcious thing of seeing an ad to something potentially bad?