It's not "girls twerking" that's the problem (that's intellectually lazy and a standard misogynist talking point). The actual problem is that human attention has been monetized (by corporations), and manipulated by bad actors (trolls and bots). It turns out the manipulating people's attention for money/ideology has some negative side effects (for them and society). Good call on avoiding social media though-- you'll avoid a lot of manipulative BS that way.