guess you can say he hasa heart of glass.
that just means an easily broken heart :/
Glass is usually pretty okay with the material of the server he's made, Blockland or not, but I wouldn't put this past him. Basic communication with him instead of simply making a drama right off the bat is usually pretty good.
Well then you'd better go destroy everything that's not a trench; 90% of the entire server actually since the server is called trench wars.
So what if he destroys your bridges? It's not like it's against the rules.
Might does not make right, friends. You can't host a party and then fling stuff at people because it's "your party". If you cheat at your own dm you are a pathetic child. Cucumberdude is in the wrong here.