I ridden in Japan, Korea and most of Europe----with my now DOT helmets. Nobody ever bothered me over a 50 year period.
In US, where maybe half the states don't even have helmet laws, no body will bother you----helmet on head, cop assumes ok----look at what the cruiser and chopper people do, skull caps and everything seems ok until you fall on head.
Don't worry.
John Grinsel