THis is just false and is obviously just a un-informed claim. The disruptor proc lowers ALL dmg resist by up to -35 (base is -10) for all incoming dmg. If your ship was reading a drop in disruptor resist it was being caused by an outside source.
If your claim was also true then that would make hybrid weapons like the Romulan and Episode Hybrid weps useless. Think about it
Actually i reported this and asked if it is as intended or a bug, disruptor procs do lower disruptor resists more then they are ment to.
Disrutor procs lower all resists as stated but more on disruptor.