It's simple. Stock Markets are super important when the Dems are in office, but they're irrelevant when the Republicans are in chair. If stocks drop when a Democrat is in office, the president is incompetent. If they drop when a Republican is in office, "why do you care so much bro?"
Tariffs are paid by the exporting country, even though they are actually paid by the importing company. That importing company should just eat the tariffs and not raise prices for stuff like cars, because we all know that companies don't really care about profits. But what the dictionary thinks of as tariffs aren't really tariffs. Tariffs are actually calculated by looking at trade deficits, so if the US buys more from a country than that country buys from the US, then that country actually has tariffs on the US. It's not because they're poor, or export a ton of valuable resources, or even because the US doesn't make anything they want, it's because they're so much more clever than the US in the ways of trade, and have tricked America.
Everybody is going to come begging to the king to reduce their tariffs, except they don't actually know that tariffs are trade deficits, so when they say they won't have any tariffs, Trump will go "Ha! Give me 300 Billion to get rid of my reciprocol tariffs", which they will totally do and then the US will have a golden age, and everybody will live happily ever after. Well, except for minorities and the gays. They go to El Salvador.