OK, I admit, that was waaay to snarky on my part. Mea culpa. 
Stepping back and summarizing what I and others have said in this thread, as I see it there three main sub topics that have evolved out of the OP.
- Is the economy under Biden actually good?
- Why do so many people think it isn’t (the actual question in the OP)
- What should Biden’s message be in light of 2.
For question one there is reasonable consensus, that the answer is yes. The objections is that it hasn’t been uniform for everyone, and there is still lots of inequality but this is pretty much always true. Even the best economy will have people who fall through the cracks, and as to whether inequality is increasing, decreasing or staying steady it seems to depend on what metric is used to measure it. Inequality has been increasing since the Reagan administration, so even keeping it steady is an accomplishment.
The economic performance is particularly strong given what has been going on around the world. The fact that we got through a multiple year shutdown, followed by war in Europe and the Middle East, and aren’t in a severe recession is a miracle.
There is less consensus on the second question with some people attributing primarily to those for whom the economy has failed. While this accounts for some of the people who say the economy is bad it can’t be the whole answer. There are always people for whom the economy isn’t working but the reviews of this economy is particularly bad, so it must be something that is different this time around.
As others have said a big part of it is the Republican noise machine and political bias, which basically locks in 40% of the public thinking the economy is doing poorly, and will be reversed in an instant if Trump comes back into office.
The other is that unlike previous economic troubles of the last decades inflation is the one we came out of under Biden was driven by inflation. When high unemployment gets fixed the unemployment rate goes back down, when the stock market recovers 401Ks return to high levels, but when inflation goes down prices still stay where they were. So fixing inflation is not obvious. Further, as I suggested earlier even though inflation is offset by wage increases, people don’t generally credit the president for their getting a raise, while they do for prices going up.
I think that these three reasons (some people not being helped, Republican partisanship and disinformation, unique aspects of inflation, explain the discrepancy.
The main area of disagreement seems to be in terms of how Biden should message his way out of this. The majority myself included support acknowledging the pain of those left behind but primarily focusing on convincing the public that the economy is actually in good shape.
Jopheil argues that this isn’t working, and isn’t going to work but admits that they, Jopheil, don’t have a solution. This may be accurate but is not particularly helpful. Even if their isn’t strategy fully succeeding in turning public opinion around it may still be the best strategy. It just may not be fully possible to overcome the locked in Republican down vote and the pernicious aspects of inflation.
SyncoSmalls has more concrete criticisms. Criticizing Biden for dismissing the plight of the left behind in interviews with journalists (but not so much in interviews with comedian journalists, or tweets or speeches). One might wonder what makes interviews different from other platforms. I think the difference is that in an interview context Biden is confronted directly with the misinformation. The interviewer starts out with a statement that the economy is not doing well and asks Biden to respond. At that point I think Biden has to be forthright in setting the record straight. Sure he should (and does) admit that the economy isn’t working for some people and talk about what he is going to do about it, but he also has to say that the interviewer is wrong when they say the economy is bad. If he just lets that go, then he is conceding the point that his administration has failed and the debate is lost.