I don't think that's entirely true. Motorcycle noise on highways can be in excess of 100 dB and is broad spectrum noise. Most highway motorcycle rides are in the tens of minutes to hours range, but the damage can occur in just the single digits to teens of minutes.

Beyond a certain point, it doesn't really matter much that something is worse for your hearing than something that will permanently damage your hearing. Plus, people are interacting with lawn equipment, motorcycles, and other such things far more frequently than jackhammers.