It took a while to realize how they use the word miss.
Their usage is more like when you say to someone who is wiping off their mouth and say "you missed a spot".
They don't mean they missed you, as in. I miss seeing you. I'm sad if I don't get to be around you. etc.
They are simply stating the fact you weren't somewhere that you were supposed to be. I missed you at the hall is really - YOU MISSED.
It is not genuine. It's just a passive aggressive swing that JWs love taking at one another.
Ah, the brotherly love is so special!