Never kept stats, but I'd say 90% of the loud and rude urban types get DENIED in the NICS.
Loud/Rude have nothing to do with getting denied.
If they've got no prior felonies, no outstanding warrants, no restraining orders, no convictions for which they could have been sentenced to more than one year (even if the the judge gave a shorter sentence including probation), no convictions of misdemeanor domestic violence... they are good to go. Quiet types have those issues in their closets, too.