Outside cats will eat almost anything and like it. Try offering it some wet cat food or some tuna and maybe it will become your friend.

Cats are easily spooked so if being nice doesn’t work, I would be surprised if a water gun doesn’t make it turn around and run away.

Been using Linux since the 00s. Took until maybe 2014 or 2015 until it got to the point where I no longer had Windows even on dual boot.