Individual Americans: When Europeans are gleefully telling you to accept that you are shit and have always been shit and that Trump is the manifestation of how shitty you are: Just simply ignore them.
Demoralization is how people like Trump and Putin and the tech lords were able to exploit us this way. They told us over and over that we are shit, we are evil, that the horrors of the world were too much, and to not believe things can get better.
But of course they can. Because you aren't shit.