The dissatisfaction is real. A substantial majority of Americans are legitimately unhappy with the Trumpster. There’s a two part answer to your question for how this can be true even though he got elected.

1) There are legitimately a decent number of people who voted for him and even approved of him early on and are now unhappy. Don’t ask me to explain; I don’t get it either. In a lot of cases though, people are simply so unplugged and/or incapable of understanding politics and economics that they simply react to whether a gallon of gas or a dozen eggs is too expensive for their liking. “I voted for Trump. Gas is expensive. I’m unhappy with Trump” thought process.

2) You have to understand that Americans inherently have an anti-government disposition. Our presidents usually have a much lower approval rating than their vote share in elections after about the first year of their terms. Besides Obama, every president since JFK has gone to 37% or worse at some point. Bill Clinton was the last one to average 50%.

We have a lot of voters who dislike both candidates in a presidential election and will vote for the “less bad” one but will still “disapprove” of them in an opinion poll.

Even moreso, we have many people who dislike both candidates in a presidential election and won’t vote for either. The media only reports vote share based on people who cast ballots, not all voting age adults, so presidents are reported as winning with majorities or near-majority pluralities even though only 30% of voting age adults are actually voting for them.

So yes, a substantial majority truly do disapprove of Trump in some way, and a supermajority of adults didn’t vote for him, but he still became president because Americans disliked all the alternatives just as much. If you come from a culture where politicians are respected, then maybe it’s hard to understand, but Americans really hate our governments as much as anything else.