The other side of the coin.
We have not raised the issue of the President's disapproval rating. In polls which seek to determine how people regard American Presidents they are asked if the approve of the President. They are also asked if the disapprove of the President.
These are two separate things.
You may or you may not approve of a person. However failing to approve of a person is not the same thing as disapproving of them. As such the two questions are asked of participants of a poll.
Harry Entin writing for Five Thirty Eight.com has posted an analysis of Trump's standing at the six month mark of his administration.
Trump’s early-term unpopularity is unusual. In the decades since World War II, the average first-term president before Trump had an approval rating of 62 percent on his 175th day in office, 23 percentage points higher than Trump’s. Only two other presidents have had an approval rating south of 50 percent at this point in their terms, and only Gerald Ford, at 35 percent, had an approval rating lower than Trump’s; Ford’s rating tumbled following his decision to pardon Richard Nixon. Trump’s disapproval rating, however, is much higher than Ford’s, and Trump is the only president of whom a majority of Americans have said they disapprove of the job he is doing this soon after his inauguration. His net approval rating (approval plus disapproval) is 54 points below average and remains by far the lowest in the period for which we have data.
Link:
https://fivethirtyeight.com/features/six-months-in-trump-is-historically-unpopular/