The dad is playing it up, IMHO. He's so deep into his troglodyte stereotype and ham acting that it's clear to me that it's all for show.
[Edit: OK...I'm 110% wrong. And here's what really has gone down
Paul Jr. leaves Orange County Choppers
"Following regular disagreements with his father, Paul Jr. was fired from the shop in late 2008. In January 2009, TLC served a notice of default due to Paul Jr.'s absence. Paul Jr. then returned to OCC briefly as a contractor, but left finally in April 2009 in order to start his own design firm, Paul Jr. Designs. Paul Sr. then exercised a contractual option to purchase Paul Jr.'s 20% share in OCC, and subsequently filed a lawsuit to force the buyout. The case remains ongoing while a valuation of OCC is performed.
On December 14, 2010, Paul Jr. won his appeal of a lower court ruling forcing him to sell his 20% ownership of OCC to Paul Sr. Jr's appeal asked that the agreement to sell be ruled invalid, so Jr will continue to own 20% of OCC until a fair selling price is agreed to. Jr has also filed a counter-suit laying out massive fraud on Sr's part in dealing with Jr's interests at OCC. The suit seeks $10,000,000 in damages along with court ordered controls over the company's finances to prevent further fraud.
After a one year non-compete clause ended, Paul Jr. opened a motorcycle shop in April 2010. TLC then commissioned a 7th series titled American Chopper: Senior vs. Junior which features both OCC and Paul Jr. Designs."
Cancellation & Senior vs. Junior
"On February 6, 2010, TLC announced that American Chopper's season finale scheduled for February 11 would also mark the end of the series, stating, "The Teutuls will always be a part of the Discovery family and we congratulate them on a tremendously successful series run." On April 7, however, TLC announced the Teutuls would return for a new series. The new American Chopper: Senior vs. Junior chronicles the aftermath of Paul Jr.'s departure from OCC and his construction of a new custom chopper shop across the street from younger brother Dan's Orange County Iron Works. It premiered August 12, 2010. The series returned to the Discovery Channel in December 2010, the network it originally debuted on."