What does “You thought you was cute” mean?

Was driving with my friend I was seating in the passenger seat and I seen a girl I recognized we just briefly made eye contact as the car drove pasted her but she recognized me as well. After this I texted her “Where you going” and she responded with “You thought you was cute”. I’ve heard this before but I don’t really understand what it really means I never intended to try to look cute i simply just made a hand gesture when I seen her and that’s it. In conclusion i’m thinking she must’ve thought I looked good and was full of myself which isn’t the case cause i’m insecure as FUCK what do you guys deduce
What does “You thought you was cute” mean?
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