The solution to pollution is dilution. If you're swamped with negative music at work, you've got to find a way to keep it out or flush it out. This means a time commitment to refreshing your brain. It's worth it, but it will be hard in the beginning. Get some positive books to read. Good stories with quality themes, overcoming, and feel good endings are a fine start, but hard core self examination geared literature is going to flush out the bad while giving you ways to make yourself better, more valuable, and might even give you enough confidence to swap jobs to a place that doesn't have profanity over the speakers.