Because stemming disturbs others . A lot . That depends on how they ' re stimming , though , doesn ' t it ? If the stimming is loud , violates other people ' s personal space , or is otherwise disruptive yes , that makes sense . Otherwise , what ' s the harm ? Plenty of NTs fidget by drumming on tables or clicking pens . Nobody argues that we have to train them to stop . And personally , I can ' t see any way it ' s less disruptive than handflapping or rocking , when it comes down to it . Those stims are at least quiet . <| sep |> Video of a scruffy protester saying the injured woman was shot in the arm with a concussion grenade . There ' s no evidence to support this account . I have yet to see anything that suggests that the police even have concussion grenades which aren ' t the same as flashbangs let alone that they were deployed or used . Not sure how what he claims happened would even work .