Never acceptable any time of the year because it is littering, but this was extra infuriating because he carelessly threw his half smoked cigarette out the window during a "heat wave" and a "high risk fire danger" rating in Kamloops. Keep your trash in your car, pig. An ash tray cup costs a few bucks at the dollar store, or use a pop can.
The whole right side of the highway is nothing but dry bushy grass... This is why we get wildfires. Careless, selfish person.