Do people drive differently to your disliking just because they have a camera then? Have you seen how these same people drive with and without the camera attached? Strange statement to make!
Not all, but a large proportion of dashcam owners definitely drive differently with a dashcam - they go out of their way to cause issues with other drivers just so they can shout IT'S ALL ON CAMERA MATE!!! and put it in one of their YouTube compilations.
A good example of this is the guy who kept slowing down and lane hogging in front of a HGV and got forced off the road, the guy who didn't pull back in after an overtake and got hit by the Audi A7 behind - there's loads more on YouTube.
A lot of these people seem to think they're police, filming people commiting minor offences and getting all angry about something that doesn't actually affect them in any way. They're often the kinds of drivers who constantly encounter "maniacs" which is why they got a dashcam in the first place, when in reality the problem stems from their own selfish, antagonistic driving.