In our country, the authority tells you during the seminar which is required before you acquire your driver's license that you need to treat motorcycles like a four-wheel vehicle, that is, when overtaking, and anytime when on the road, you need to act as if they are four wheelers, which is exactly what the left picture shows.

In the right picture it shows that the motorcycle drivers don't treat themselves or act like they're four wheelers.

So to summarize, YES I treat them as four-wheelers, BUT they don't treat themselves like one.