The difference is that Trump is working while golfing. While Obama did golf with a handful of world leaders during his presidency, he mostly went golfing with celebrities like Tiger Woods. Business people like Trump use golf outings and other seemingly social behaviors to build business relationships. As long as he's doing it with world leaders rather than to scratch his fan-boy itch, that's fine. 

Like him or not, Trump knows how to do business and it will be interesting to see if our foreign relationships improve through the application of business practices rather than being the lecturer-in-chief that Obama thought was his job.

And, he was certainly right about this -- "And that same year, he suggested that Obama should have expanded his circle of golfing buddies to include more Republicans: "That way maybe the terrible gridlock would end."

Obama had opportunity to be a uniter, but chose to stick wit those he liked & agree with. It remains to be seen if Trump will be different.