Some of the worst images and videos I've seen in my life have been from twitter, and not a single one was marked potentially offensive (and believe me I've seen some shit). Same with text, to a degree.

That said, I was pretty consistently able to identify the tweet that was going to be classified as offensive, 8/10. Honestly this was better than I expected as a normal twitter user.

Edit: I had to disable enhanced tracking protection in firefox to get this to work.