Being self righteous is part of a hobby... at least for many of us. Perhaps you consider it a pastime.

Websters:

Hobby:
A subject or plan upon which one is constantly setting off; a favorite and ever-recurring theme of discourse, thought, or effort; that which occupies one's attention unduly, or to the weariness of others; a ruling passion.

Pastime:
a subject or pursuit that occupies one's time and thoughts (usually pleasantly):