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Related to pick on: pick out
pick on (one)
To harass, bully, or tease someone. If kids are picking on you at school, then you need to tell me or your teacher about it! Jim, stop picking on your brother, please.
pick on someone or something
to harass or bother someone or something, usually unfairly. Please stop picking on me! I'm tired of it. You shouldn't pick on the cat.
Tease, bully, victimize, as in She told Mom the boys were always picking on her. [Second half of 1800s] This expression is sometimes put as pick on someone your own size, meaning "don't badger someone who is younger, smaller, or weaker than yourself but do so only to an equal."
To treat someone badly or unfairly, especially by teasing or bullying: My big sister always picks on me. The kids at school pick on him for wearing glasses.