Either way mentally indoctrinated JWS will shun, disrespect or demean anyone they know who left the organization and this can vary to the slight to the extreme.
These occurrences are well documented here and other Web forums .
Why this happens is a causative effect of people showing their steadfast loyalty and devotion to the Organization which to them is Jehovah's chosen organization, ingrained fear goes along way to control people's thoughts and behavior.
Its not surprising for JWS who come across inactive ex members to show a smiling greeting, some JWS are constantly on the ploy to shepherd lost ones to the flock so to speak.
We know that so most just play along......... at least I do.