Discrimination in application of By Laws

I have recently been served a notice in relation to a breach of the by law regarding putting screws into common property walls.  There are at least 7 other units in our block of 14 where owners have breached the same by law – inserting screws, drilling holes in front doors, affixing external sun blinds, painting common property walls to match their interior.  These are only the instances I can see from outside the building.

Of course most owners have hung artwork, or mirrors and painted common property walls over the last three decades.

My question is – can this by law be selectively applied to me or is the Owners Corporation required to be even handed in by law breach notices?