A true racer is me
Seriously, you´ll get as many definitions as people posting, too subjective.
Drivers must defend their own interest as much as posible, and that implies fighting for any position as hard as posible. But, what´s possible? Some people will say pushing your rivals wide is a sign of competitiveness and is ok, and some others will say that´s not fair and is beyond the limits. That´s just an example, but I guess you get the idea, racing is not mathematics and each incident has multiples interpretations, so there will always be discussions about what´s within the limits and what´s not.
Another example, TOs. I´ve read people stating disobeying TOs is a sign of a true racer. To me it´s a sign of arrogance.
There are tons of examples like these wich make it imposible to state what´s a true racer, there will be as many definitions as fans.