Josh Brown has a great analogy about the relationship between the economy and the stock market. Picture a person walking their dog across a park. He starts on one end of the park and crosses to the other in a straight line. His dog zigs and zags all over the place, running to his left and his right, up ahead of him and back behind him. Sometimes the dog is running, especially if he sees something that gets his attention, and sometimes he walks more slowly or stops to take a break. Both the dog and the person eventually end up at the same place. The economy is the person, the stock market (and financial markets generally) is the dog.
The Nasdaq and big tech is holding up well for logical reasons, even though I agree those names are overvalued at present and were overvalued before this drop. Slightly over one-third of the Nasdaq 100 is MSFT, AAPL, and AMZN because those companies are so massive. Neither of those companies, at least so far, has seen or is expecting to see massive earnings hits as a result of this. In fact AMZN is thriving, and the products that MSFT and AAPL make (cell phones and computer software, among other things) are basically seen as necessities today; they weren't 15 years ago, but are today. If you look at the names at the ground zero of the crisis (leisure, travel, hospitality) those stocks got destroyed then simply stopped going down - they never really bounced with the market and in some cases (like AAL today) they are making new lows.
Remember - stocks at the end of the day are a barometer of the earnings of the underlying companies...not GDP, the unemployment rate, wage growth, or anything else. Nothing more, nothing less.
You also have to keep in mind that in addition to being a measure of how well the economy is doing markets these days are also a measure of liquidity in the system, especially with interest rates as low as they are. There was a panicky event initially the caused a flight to cash, so everything sold off. The central bank stepped in, panic has apparently eased for a time, and folks have tentatively returned...that causes a bounce, and it shouldn't be surprising that as confidence returned money went into the names that were working pre-crisis (tech).