(I think tariffs are stupid)
> The exporters aren't impacted directly at all
This isn't true, at least if you believe in standard economic theory (not believing standard economic theory is what got us in this mess!).
The issue is that the tariff increases the effective price to the consumer, so it shifts the demand curve downward by the cost of the tariff (the price consumers are willing to pay the producer for a given quantity of goods).
Markets always find their equilibrium, and the resulting equilibrium point is a lower transaction price and lower quantity than before. Quantifying the shift requires knowing both the supply and demand elasticities.
In other words, both the producer and consumer share the burden of the tariffs. The producer receives less from the consumer, and the consumer pays a higher total cost than before. Who pays more of the tariff is question that we again need the elasticities to answer.
It only hurts the producer if they don't find alternate markets.
There will absolutely be some short term pain. But in the long run it makes the producer stronger.
Now it's easy to cherry pick products that are easier to move than others. There absolutely will be winners and losers on the production side. It'll certainly be interesting to see this play out.
You are describing indirect impacts though. The exporters does not directly pay tarrifs except if they're also the importer, or acting as a facilitator on behalf of the customer. The change in demand is indirect - because it can only happen if customer behavior changes. Does the consumer care about 100% tarrifs on a $1 product with no internal competitors? Probably not. Demand may be completely unaffected, and in any case that's a problem for the importer who has to clear things through customs, not the exporter who simply has to label things appropriately like they always have.
But that's not what people think: People think the tarrifs work like a bill from the US government - like taxes, where they understand it's possible (though again, generally not how) to wind up owing the government more money in September.
What they imagine is very clearly something that looks like that - that companies directly pay some fee to access the US market and then sell things as normal. Or will be taxed some extra money after selling things to the US.
Yes it's all wildly inconsistent on the slightest inspection, but people are relating to this on a vibes level and then generally inventing the justification post facto because they certainly never thought about tarrifs till this president.