Most tarrifs work best when implemented for specific industries. We tarrif Chinese EVs so that American automakers can compete. We see similar things across other countries for similar industries.
The reason these tarrifs are causing concern is because the numbers aren't based on these countries actually having tariffs, but trade deficits. This tweet breaks it down pretty well:
The concern is that by tarrifing allies and non-antagnostic countries for essentially no reason, we're going to weaken our position as the world's #1 importer, I.E. why the dollar is the reserve currency.
China, South Korea, and Japan already working on trade agreements in anticipation of these tarrifs isn't a good thing for us.