I get offended when people think the mandolin is a ukulele. Am I very immature?

I am a Carnatic classical mandolin player. Most of my friends, cousins, and basically anyone who sees my instrument asks "That's a ukulele, right?" I feel very angry about this. Is there a stigma against ukulele among many musicians? A lot of people think it's basically a toy and not a "real" instrument. Am I suffering from this same mindset?

I get offended when people think the mandolin is a ukulele. Am I very immature?
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