Raising income shares of the rich doesn’t ever trickle down to benefit the working class — look no further than the Bush and Reagan tax reforms for evidence.
I’ve studied the Reagan era, which I also experienced as an adult, in detail. It makes case for lower marginal rates pretty well, so you’re not improving your argument by referencing it.
Now, when you dig into WHY the Reagan cuts did help all classes of individuals, you realize that it is not a case at all for trickle down economics as that term is often used by pundits (there is in reality no such thing as trickle down economics, but it’s become generally used to describe the notion that tax cuts at the high end benefit those at the low end), but a case for freeing up capital for more efficient use.
The tax reform bill is a mixed bag, particularly on the individual taxation side. However, the corporate tax reform is a huge win for the US economy, and Republicans should be praised for getting something done that’s been talked about for two decades, while Democrats should be spanked for opposing something that they themselves supported before they realized that Trump would get the credit for it.