Studio

Studios (Also known as Galleries) is an innovative use of Scratch. A user (Scratcher or New Scratcher) can create a studio for one specific subject, or for simply AE purposes. Some Scratchers often use Studios as proposals or organizations. Another useful use of Studios is collaboration projects.

Studio Reporting
Just like reporting on anywhere else, if one finds that a comment is inappropriate, they could hit report and select a reason, or if those 3 reasons don't match, then they could contact the ST (Scratch Team) about the report.

Although, Studios have an unique feature. If the studio itself (not counting the comments) is considered inappropriate or rude, then click the Report button found under the thumbnail and just like comments, choose a reason.

Trivia

 * As of December 20th, 2014, there is no way to delete comments without reporting the comments in a studio.