Blind people are no less capable of throwing stones, and you only have the flight advantage if the ground is potentially-treacherous (e.g. unmanaged forest, scrubland) or you're that much faster. Any inhabited area will have been engineered to be safe for people to navigate – and it will not be lit well at night, where your reliance on vision will put you at a skill disadvantage.

The main advantage in an urban combat environment, I think, would be the ability to detect quiet people at a distance. Not needing to see makes it easier to hide yourself from visual inspection, but why would anyone develop this skill if nobody can see? Then, if the only person to practice with is the enemy you're trying to hide from… Also, you'd be able to dodge projectiles by watching the person throwing them, who might not telegraph their throws audibly, but would probably do so visually. This would let you defeat a single ranged opponent, possibly two – though I doubt your ability to dodge the rocks from three people at once for long enough to take one down.

But what do you gain from winning fights against small numbers of people? (I doubt very much you could win against a group of 30 or 40 opponents, with only sight as your advantage.) You would run out of food, shelter would be hard to come by, and every theft of resources would risk defeat: and one defeat against a society means it's over. Either you're killed, imprisoned, or they decide to do something else with you, presumably depending how much of a menace you've been. Your only options are to attempt a self-sufficient lifestyle (which you probably won't survive for long), to flee somewhere they haven't heard of your deeds, or to put yourself at the mercy of the justice system (and hope it isn't too retributive).