Why did I get sour looks from others when I let my tires skid?

There are several downsides to skidding, and no benefits (unless you think it makes you look cool). First, a tire that’s skidding isn’t providing any steering or braking control. Second, it’s eroding the trail, which is environmentally unsound, and will detract from the experience of other bikers. Finally, if that’s not enough: You’re wearing out your expensive tires!