In short: I play ojs. Just found out that someone across the street from me plays cabs. Im afraid that we'll keep spawning on each other and just kill each other and the others base when offline. So... What do?
Friend them, then PM them, work out an agreement. A no-beacon truce works best--neither of you can put up a beacon at home, and you don't attack each other's things. That way, his friends don't nuke your stuff, yours don't nuke his, and you two aren't constantly squabbling.
Ran into the same issue with my neighbor. We worked out a deal. The spawn zone is neutral. No one places structures, but we can attack eachother. We were lucky enough to each find a gate to either side that is far enough out to put up a beacon without alerting either team to the others presence. It has worked so far. The neutral zone deal made all the difference. I have no such deal at my other spawn zone, so we are always rebuilding out there. With this new free range gate thing it just made it worse. Anyway, it's a truce or all out war all the time.