Am I being laughed at "low key" Body Language "experts" wanted?

I'm a pretty chill dude

I keep to myself & don't bother anyone nor try to befriend anybody

YET when I'm talking to MY people in my area of my apartment... there's a few people who already don't get along with me

who SMILE with their mouth completely CLOSED while passing by me when I'm conversating

It happens only with people who I already have issues with that happened to live around me for years+

That stupid "closed mouth smile" irritates me to no end

Am I being laughed at "low key" Body Language "experts" wanted?
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