"Love bombing" is a tactic quite typical of all cults, when they are dealing with potential recruits.
To the JWs, this would include all "Worldly" people - hence their going out of the way to appear to be nice and friendly.
In my own case, I first heard glowing reports from my grandparents about how "happy and friendly" these Jehovahs Witnesses were. Then certainly, my initial impressions were similar.
It is only later - when you have missed a few meetings, or the "Hours" column of your Field Service Report looks a bit lean - that you discover how superficial this "friendliness" can be.
Bill.