to skip a named subdir

output.txt

$ ./skipDir.sh
/a/b/c is permitted
/e/f/blah is banned

skipDir.sh

#!/bin/bash
bannedDirs=(
    bin
    blah
)
for actualDir in /a/b/c '/e/f/blah'; do
    isBanned=
    for bannedDir in "${bannedDirs[@]}"; do
        [[ "${actualDir##*/}" = "${bannedDir}" ]] && isBanned=1
    done
    if [[ "${isBanned}" ]]; then
        echo "${actualDir} is banned"
    else
        echo "${actualDir} is permitted"
    fi
done