Yeah, but, apparently you didn't list every single reason why Trump was elected that you could think of. Therefore, focusing on the one portion of what the rapper said as it relates to the election must necessarily mean that you were saying that the only reason Trump was elected was racism and that that is in fact what you personally believe. It's so obvious!
/sarc. off
I suspect he knows full well that you were referring generally to one of many contributors to Trump's election. When David Duke and various white supremacist groups are praising a candidate and then that candidate says he doesn't know what "white supremacy" even is, let alone who David Duke is, it's undeniable that racists felt empowered by Trump's campaign regardless of the existence or not of any intent by Trump in that regard. Then there are the many campaign incidents, the upsurge in white nationalist protests, focus on speakers, etc., since.
I'm not about to extol Jay-Z's brilliance. It's not particularly difficult to understand that the last couple decades of actively ignoring racism would produce an effect ranging from absolutely neutral (unlikely) to an increase in the acceptability of racism (a bit more likely). And even IF Jay-Z was saying that Trump would not have been elected but for racism (I wouldn't necessarily agree with that if he did mean it), that does not mean that other contributors to his election were absent; it would merely mean that the racism pushed him just the last bit over the line. It most certainly does not mean that that is what you yourself believe, of course.
It wasn't particularly difficult to work out that you were not claiming that racism is the only possible explanation for Trump's election, but were instead focusing on the aspects of the subject you wished to discuss that were relevant to the point you were making. After all, people tend not to read posts that attempt to address all possible things someone might say or think about a given point.....
So, hey. Some of us get what you were saying. Some would like to pretend they don't, to score internet points or something.