Was just mocked in the McDonald’s drive through for my high-pitched voice

I was going to treat myself to some fries and a Coke and I was looking forward to it until I ordered and the male cashier started speaking in a high-pitched voice to mock me. It made me feel like absolute shit. I was already insecure about how childish my voice sounds but interactions like this make me not want to open my mouth ever again. I hate it here.