Among other things, Trump has:
1. Deliberately held back legally-required support in order to extort Zelenskyy for favors in his first term.
2. Accused Ukraine of starting the war with Russia, which is utterly insane.
3. Disparaged Zelenskyy as "dictator" while simultaneously refusing to ever say anything remotely the same about dictator Vladimir Putin.
4. Earlier tried to slip Zelenskyy a time-limited lowball deal of "50% of all your mineral rights in exchange for basically nothing".
5. Illegally halted funds going to civilian relief groups operating in Ukraine.
Even a schoolchild should know that someone who constantly disrespects others does not deserve respect.