Why is it that guys always grin at me? what is so funny about me?

even with this guy I went on a date with, he laughed at me when I couldn't open the bottle. and when I'm out in the streets some guys just grin when I'm talking with a friend for example. is it because I have an expressive face and voice? can a girl look so stupid that guys grin at her?

i have to admit I am a bit like a happy child sometimes (like jumping from one stone to the other, or ii have to walk under the fountain when passing it by :P). all that although I'm a lady most of the time, maybe that's why it looks funny?

many times they grin at me when I'm talking to other guys. but it's not a "flirting grin" it's a "i laugh at the situation"-grin! and also, most of the time it's guys 30+ who grin...

why is that?
Why is it that guys always grin at me? what is so funny about me?
Post Opinion