It's starting to sound like you're saying he's a bad host just to say he's a bad host.
I chose to respond because his justification was that it was his server and thus Darth was wrong to complain.
But he never, or at least I never saw him, warped into onto the middle of the battlefield, the enemy's base, etc.
There is no good reason for him to warp around at all in the middle of a deathmatch, unless there is an urgent issue.
And he never got any weapons that weren't obtainable from everyone else.
From what I've read, you get weapons by getting points. From what you've admitted, you gave him access to a brick evented to give him a hundred points for clicking it. Anyone could tell you this is unfair.
He wasn't complaining about how they got out, he was complaining about them getting out and shooting from there, even though he didn't care that his teamates were doing the exact same thing.
Which is more obvious, the people climbing out of the map, or the people climbing out of the map and shooting you?
Poor map design and unfair advantages are legitimate reasons to complain. If you actually put forth the effort to fix climbing out of the map, didn't give your brother free access to the weapons, and informing him that using flycam in a deathmatch is usually bad etiquette, maybe you wouldn't have to worry about people like him.