This is the Designated Hero Trope, as stated on the Bad Writing Index on the site, having your hero kick the dog and still expect him to be accepted as an ideal hero because you say so does not usually work, making him unlikable: link

To quote the Scrappy Page for Anime: link
"She attacks Bit for the slightest infraction, from breaking his back for setting her up on a date with Harry to attacking Bit with her Zoid for accidentally walking in on her in the shower, and attacking her own teammates so that she is the sole winner of the fight."

Would you still be considered heroic if you apply disproportionate retribution like she did: link

Would it really be right to attack your comrades just to be the sole winner of a fight against your opponents like she did?