Spin around the thread ring

Many people misunderstand "Bernoulli's theorem" as "the pressure decreases where the flow is fast". There are many science book writers and science teachers who misunderstand this. It feels as though many introductory science books have mistakes regarding this aspect.
"Bernoulli's theorem" is the energy conservation law of fluids (gas and liquid), and it states that when comparing the total energy of the upstream point (point A) and the downstream point (point B) along the flow, the total energy is the same if there is no energy loss or supply in the middle. What is important here is that (1) the two points to be compared (point A and point B) are upstream and downstream on the same streamline, and (2) there is no energy loss (e.g., loss from viscous friction) or supply (e.g., acceleration caused by a fan halfway through). If those conditions hold, the sum of the energies of the two points is equal. After satisfying the above two conditions, it is correct that "if the heights of the two points are equal (i.e., if the potential energy is equal), the pressure is low where the flow is fast".
In this experiment, it is not correct to compare the energy between the flow in the straw and the surrounding stationary air (i.e., not on the same streamline); furthermore, the inside of the straw is strongly affected by viscous friction, and the energy becomes smaller (resulting in lower pressure) as it moves downstream (pipe friction loss). At the outlet of the straw, the pressure is almost atmospheric pressure, so the pressure inside the straw on the upstream side is higher than the atmospheric pressure.