I do believe haberdashery such as this does qualify as PvP abuse. Pirates have to give people adequate time to respond to their offer. It is the same way with this.
/set chattime on
Screenshot your death message directly after the engagement notice, along with their ship type, and them draining your shield without notice. PvP abuse sanction on the way.
This is the same for trade ships. If someone drains you to almost dead, and then SNs you right after a pre-typed demand, you were unfairly killed and can file a report for PvP abuse. It just isn't fair for anyone to do things like this.
Also, if you are doing this, just remember: it isn't nice to do this. I've had it happen to me more than once in Kyushu when I flew a Preagle and all the Red Cats were about (What's up .84). Razor + SN while I was typing and I didn't even see it coming. Not nice at all. No one gets a good feeling out of a fight like that. Does that Blue Message really give you pride? Is it really worth it? No, it isn't. When it comes full circle and happens to you, you'll realize that...
[8:32:45 PM] Dusty Lens: Oh no, let me get that. Hello? Oh it's my grandma. She says to be roleplay.
[12:49:19 AM] Elgatodiablo: You know its nice that you have all that proof and all, Bacon... but I just don't believe you.