Got told to stop smiling / laughing by an older man

I’m F23, honesty pretty surprised because I’ve never ever gotten this before. If anything I’ve gotten the opposite where I was told to smile.

I was at a distant family friend’s house yesterday and he’s an older man, and more or less while I was speaking to him about a totally casual topic he told me to sit down like he wanted to say something serious and told me that I smile\laugh too much and that he knows I’m very smart and that people will judge me and think I’m stupid?

Honestly I was really shocked because I’m extremely extroverted and have a lot of friends that I love, I’m always myself and am quite successful in the sales field so him being so serious and making me feel silly for being smiley/laughy made me overthink a lot.

He apologized later for his tone and was super nice saying that I’m welcome anytime and tbf he dropped me off home which is very far after I stayed late at night, but it’s playing on my mind a bit. I don’t know if I should take his advice, or if he was trying to say something else.