Seriously, high school rep is way less important than you think it is. There's no need for you to feel pressured into doing anything, so if you don't want to fight anyone, just report it to the principal. Doesn't make you a pansy, it's their job to deal with this shit.
The big brother sounds incredibly immature if he thought hitting you with a stick in front of a girl was impressive. He's probably a small man on the inside and will turn into a sniveling, pants-wetting child if an adult gets involved.
Alternatively you could talk to the big brother and tell him you didn't do anything to provoke the smaller kid and you're not interested in the drama they're stirring up. Make sure you're sincere and respectful, because both of them sound like they have issues.
Or, of course, you can fight one or both of them if you want to. But that's probably the most childish solution, and wouldn't make you look like a very respectable person.
The big brother sounds incredibly immature if he thought hitting you with a stick in front of a girl was impressive. He's probably a small man on the inside and will turn into a sniveling, pants-wetting child if an adult gets involved.
Alternatively you could talk to the big brother and tell him you didn't do anything to provoke the smaller kid and you're not interested in the drama they're stirring up. Make sure you're sincere and respectful, because both of them sound like they have issues.
Or, of course, you can fight one or both of them if you want to. But that's probably the most childish solution, and wouldn't make you look like a very respectable person.