I really should hold a grudge for that!
You should thank them!
If the green alliance hadn't taken Fisdnar and then mocked you for months and months afterward, it wouldn't have been possible to come back on May Day with thousands of troops and drive a pitchfork into the heart of their alliance since Fisdnar was sort of a last stand for some of it's leaders. The low moments just made the highs so much better.
For people who didn't play strat v.3, this is what happened in a nutshell or at least my barely paying attention version:
The green alliance took AI villages with little resistance and then bored themselves to death while sitting around for months trading inefficiently and not taking AI castles/towns. Meanwhile the Fisdnar rebels were training like Rocky in
Rocky 4, sometimes doing things they weren't proud of to make gold, sometimes just for a bite of kebab. Then one day some guy who owned a green colored village on the border of Hospitaller territory raided them and green alliance people signed up for his roster. That started a war between Red (Hospitallers and Hate (heh) aka Astralis/DL) and Green. It might have been started a little premature for the green side but the battles looked like good quality, full roster fun battles at sane hours, the way strat should be. While red and green were in the middle of going at it, EU clans took advantage of this to launch a full scale invasion of green territory and the green alliance crumbled because most of them were playing Star Wars. And then Fisdnar was freed, the end.