Most Helpful Girl
Most Helpful Guy
I'm going to mention both genders since I wants to share my whole opinion on bad haircuts generally.
Short hair like pixie haircut, buzzcut, undercut etc. is something the majority of girls and young women don't suit in my opinion. It exists some few exceptions, but it's mostly elderly women who suits it short.
Round feminine haircuts, non-styled hair (like no hair gel or wax) when it's short and when they don't shave their heads when they're balding is haircuts I finds bad looking when it comes to men.
Alternative hairstyles like mohawk, emo haircut, mullet and dying hair in unnatural hair colors like blue, green, purple etc. don't look good on anyone. But usually it looks worse on guys than girls. Thinning hair also looks bad in my opinion.