One is a personalized echo chamber, the other exposes you to the most provocative (by interaction) content. No shit your twitter feed is more aggressive... your personal facebook feed has nothing to do with how toxic facebook or twitter is in sum.
The critics seem content with Twitter because it flags a RealDonaldTrump tweet from time to time. Perhaps Mark simply needs to do that to silence criticism of its platform?
Twitter has traditionally given world leaders (like the president) a pass on their community guidelines that bind every other Twitter user. Twitter is now slowly correcting that, but it's only becoming visible with world leaders who had previously received a pass.