Why does my mum's partner always give me unsolicited advice?

Every time I go to my mum for advice on something, or if we are arguing, my mum's partner always jumps in and gives me unsolicited advice as well. He also gives me advice (which he calls "observations") on my hair, clothes and appearance. He'll be like "can I make an observation? Your hair was better before." I ask for advice from my mum about my estranged abusive dad, and again her partner always jumps in and tells me what to do. It really irritates me sometimes because I don't know him like that and I didn't ask him. Am I being childish in not wanting unsolicited advice, or is he sticking his nose in something that isn't his business?

Why does my mum's partner always give me unsolicited advice?
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