You out-played your opponent. Well done. Maybe they'll get you next time with a Lambda fortress or Han Shot First or a TIE swarm -- all of which have been derided as unsportsmanlike by someone at some point.
The meta will take care of itself, and sour grapes are a thing. It's not a popularity contest, so go ahead and do everything you can within the rules to win -- that's what competition is all about. If you strike upon a particularly effective strategy, others will adjust, or they'll get used to watching you win.