Oh now common. I was anything but unsportsmanly.
I have been trounced by early rushers before too; it is frusterating. You explained your position; pillaging my provinces and bumping taxes in your own for a resource war. That is legit. I think scorching the earth for bitterness' sake is wrong. You didn't do that, so I don't know what the argument is.
I would have been upset if you started pillaging Marverni the turn we attacked eachother. You didnt even scuttle the lab, which was nice of you. (Your spirit lived on and a random event burned it down a turn later though
).