Difference between Joking n Criticising

"haha, u so ugly, of cos they dowan let u in lah!"
this is a joke.
bringing it further,
"haha, u so ugly, of cos they dowan let u in lah!"
reply "thanks leh! but no lah the other time i went in before.."
"huh? really? but i always thought they only let in pretty pple."
(in a serious tone, really considerin the possibility)
this is a super insensitive comment.

ok, time for disclaimer..
i think jokin n criticism can be subjective..
to context,
to tone,
to people with different views,
to the speaker n listener,
and there may be more i cant list.

to the speaker,
the above statement might only have been
a pure stating of his thoughts.
that he was just being straightfwd,
and frank, and truthful.
however, it is totally tactless.

in this case,
showin displeasure n disgust at the speaker
could be a case of:
1. pettiness
2. real disgust at his insensitivity.

it only takes a few moments
to process the stuff that u wanna say
into ur 'Big Brain",
as the laymen so often call.
why splurt those tactless n useless comments
and display ur wonderfully disgusting nature
when u can take a bit of effort in trying not to do it?
oh. i perfectly understand.
it's becos u totally are not remorseful.
that u really feel it's nothing
and the listener is just being pathetically sore.
then, stay the disgusting way u are,
and i shall say no more.

::lesson of the day::
u can't judge everybody by ur views.
everyone's unqiue in his own way,
with his own outlook on life.