Why is Elisa Martinez evil?

This will be my last rant, before I be mature.
==What had happened?==
#We went to get bundt cakes after going to California Pizza Kitchen.
#Elisa thought that I had put her leftover pizza in the wrong way.
#I punched myself in the face, believing that it was my fault that Elisa scolded me.
#For the rest of the outing, Elisa called me immature, which ruined my sanity.
#I had to contact dad from one of the merchandises at T-Mobile.
#She still called me immature.
#Dad believed that it wasn't my fault [entirely] that I acted immature, and that Elisa pushed my buttons, ruining my sanity and the perfect afternoon.
==Days later==
*Alex packed oval tine milk in a water bottle with a straw, since mom told him that the water filter was only for water.
*I was never going to drink oval tine from the straw; I was intending to drink from the lid.
*When I was going to English class, I realized I left my drink at home.
*When I found it at home, I put it in the fridge, saving it for breakfast, tomorrow.
*Elisa found it and yelled at me.
*I know this is immature, but I had to tell mom that it's not my fault that I ruined Christian's water bottle with the oval tine mix.
*Cocksucker Elisa accuses me of acting immature, even though I am 99% innocent with 1% of some vacuous behavior built in.
*Even I knew I was never going to drink from the built in straw, but rather, I'd drink the mix with the lid off.
*Elisa can be a stupid liar most of the time.
==Moral==
Don't let that cocksucking bitch, known as your sister, bother you emotionally and mentally.