Full marks to the Zambian agency for understanding social media marketing and how to get an advertising headline into the news. Not so good execution though - would have been better to have done something anti-Trump rather than anti-American, ommitting the stars and stripes reference.
However, unfortunately, to many other countries Trump is the face of the US for now, and they don't know so much about his level of support and how divided the country is.
I think with George W Bush there was a period when it was a bit embarrassing to be from the US in Europe and many other places but that was all forgiven and forgotten by the Obama era. However, Trump is a whole other level. He is creating a more severe damage to the reputation of the US abroad, but also perhaps a more lasting one that will somewhat linger even after he has gone.