Don't like coming across as naive at work :(

Today I was handing over tasks to the next person at the end of my shift. When I was almost done talking, one of the two people smiled a bit, like a little smirk. Not a patronizing kind, but an "oh bless yer heart" kind of smirk. Something that would mean "you're too naive".
:( I hate it. I hate it. I hate coming across as naive. Maybe it's the way I talk? Or the way I say some things, or maybe my facial expression? I feel so dumb :(