Bronx County has not voted for a Republican Presidential candidate since 1924 and even then, Calvin Coolidge received a plurality because of a progressive third party candidate, Robert LaFollette. In 2016, The Bronx gave Trump only 9% of the vote.
Consider that in super-red areas like the Texas Panhandle or western Kansas, Biden would never venture, for at best he would be ignored by the locals. The Bronx is perhaps as deeply blue as any county in America. Yet Trump was warmly welcomed by the locals.
The Bronx is a borough, not even a county, but I get where you're coming from.
Dems NEVER go to really RED places.