When you call a random girl pretty do you expect her to say you’re pretty back, and if she doesn’t does that mean you’re ugly?

I am a girl and every time I tell a random girl she’s pretty like a cashier or someone I may see, they say thank you but they never say “oh so are you!” so I am paranoid that this means I am ugly. Or when someone calls you pretty are you just supposed to say thank you and move on? I think that just because they don’t say I’m also pretty, it means I’m ugly.

anytime a girl has called me pretty I respond “thank you so much, so are you!” And I mean it because I don’t think anyone is ugly.
When you call a random girl pretty do you expect her to say you’re pretty back, and if she doesn’t does that mean you’re ugly?
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