Since when does a background check include looking at internet history I know you put the "if" there, but you are acting like people are actually looking for it. A hiring manager wouldnt know I go by Dirk the Goat Fucker online. All they would know is my credit report, criminal background, job history, and educational background. I have conducted over 1000 interviews for a fortune 500 company and have never once had browsing history come up. I could see if he was interviewing for a special government job... but 99.999999873% of jobs dont go that far when checking a person out. The only time you really have to worry about your browsing history is when you do it on company owned equipment... and at that point you already have the job.
P.S. Being a redneck that likes racing doesnt come across as a bad thing to me. Most rednecks love racing and plenty are gainfully employed across the United States ( but mostly in the southern states ) /my opinion