My big brother used to lock me in the closet, chase my long hair with a portable vacuum cleaner, belittle my accomplishments and tried to turn me into a "mini [surname]" instead of being my own person in HS, insulted my denomination of our religion because it didn't match his own, and to top it off, attacked my fondness for a game that HE taught me how to play. We haven't spoken in about 12 years. Guess why!
Also comparatively, my big sister tends to cut me off mid-sentence, speak over me, and generally interrupt. I can deal with that though, so she's cool.