Okay, I'll take the bait.
1. National Debt. The tax cuts which you so cherish are just a giveaway if not accompanied by spending cuts. The National Debt is ballooning more under Trump than any prior administration, Republican or Democrat. It feels good now but my generation, and yours assuming you're younger than me, will be paying for it all. The Democrats don't really care either, so these parties cancel out in my mind on this issue. Although it's worth noting that the budget deficit was actually lower in Obama's last years than it's been under Trump. https://www.forbes.com/sites/chuckjones/2019/01/18/trumps-big-win-the-largest-budget-deficit-with-a-strong-economy/#296a591049d1
2. Alliances. Trump regularly shits on our allies publicly. NATO is in a more precarious state now than it's ever been, and Russia is laughing at us. China is taking this opportunity to build coalitions across the world. North Korea issue has not been solved despite all the public fanfare. The Middle East is a box of matches ready to ignite, and almost has several times under this Administration. I commend Trump for finally getting rid of John Bolton, but he never should have been there in the first place.
3. Entitlement spending. Continues to eat up so much of our budget and has not been reduced. Republicans like Paul Ryan used to actually make a push on this issue. However, on the primary campaign trail in '16, Trump was one of the only Republicans to explicitly call for not only protecting, but increasing, spending on things like Social Security and Medicare. And he was generously rewarded for that stance by the senior vote. Again, things we'll be paying for later.
4. Free trade. Trump has engaged in trade wars with our allies and rivals. I actually support his efforts to hold China accountable on trade, but not his reneging on trade deals with countries that should be our friends. (NAFTA, the TPP, and cross-Atlantic trade)
5. The examples of Trump's disrespect are too numerous to list, but include: 1. Mocking that disabled reporter; 2. "Grab 'em by the pussy," 3. The Mexicans-are-rapists comments; 4. His birtherism against Obama; 5. "Lock her up" against HRC; 6. Unfounded allegations of corruption against Biden. All of this is poisoning American politics.