It is masculine for "you are mean".
¿por que eres tan malo?
you are nothing bad
"You're bad" is an English equivalent of the Spanish phrase ¡Tu eres malo!Specifically, the personal pronoun tu means "(informal singular) you." The verb eres means "(informal singular you) are." The masculine adjective malo means "bad."The pronunciation will be "too EH-rehs MAH-loh" in Spanish.
Porque eres tan malo? (mala, if feminine)
eres tan malo/a
Tú eres = You are
what are you?
There is not an exact translation for "You are mean". Instead you can say: "Eres malo", "Eres cruel"... -Tu eres malo
"El malo" translates to "the bad one" or "the evil one" in English.
tu eres malo
bad
Eres la persona más dulce que jamás he conocido