You can protest Betsy DeVos' nomination, you can question her experience or preparation - all things which her opponents did to try and block her confirmation as education secretary - but you can't physically intimidate her. As DeVos, the new education secretary despite an all night filibuster, tried to enter a public school Friday morning, protesters blocked the entrance and shouted "shame!" at her.
A local ABC affiliate caught the confrontation. As you can see, the disruptors also tried to block her car from leaving the premises.
This...is a bit more aggressive than waving a sign.
Meanwhile, Democrats on the hill have been protesting just about every single one of President Trump's cabinet nominees. Three weeks after becoming president, Trump has about a dozen nominees still waiting in the wings.