This is not surprising. The extreme distaste those born after about 1971 have for Trump was evident in the GOP primaries as well.
As many over 45 will no longer be voting in 2020, I believe this gives Trump reason to worry, even if, as some reports suggest, the next wave of new voters is a bit more "conservative" than the last.
Gen Z is probably gonna be the anti-thesis to millennial. Generation 9/11 grew up on patriotism, support the troops, and war video games like CoD. If anything I expect more of a social libertarian streak but they will not be liberal or more so than millennials on economics and domestic issues. The universe must remain in balance so generation 9/11 must cancel out the SJWs
Studies have shown that Gen Z is socially moderate/liberal and fiscally conservative.
