Considering how laughably biased the media has been against Trump, relative to the exact opposite treatment that Obama had, he’s actually doing amazingly well in this regard. I think Trump has made a tremendous number of mistakes, but just going by the numbers, he seems to holding better than Obama ever did given the headwinds he faces.
My guess is Obama’s disapproval rating would have started off far higher too if Republicans were rioting in the streets and claimed cheating in the wake of his election. But Republicans didn’t do that, and took a considerably higher road than Democrats have done since Trump’s election. It has been shocking and terribly disappointing to see how poorly Democrats reacted to losing, and that poor sportsmanship is still playing out. It turns out that the “party of tolerance” is only tolerant of those in its own party.