you respond to what the person says theyre doing with what you think when you see it, and what you would do when you respond.
ex.
(poster above me):im walking down the street without pants.
(me):Thought- are a man or a woman?
action- *yells "DUMBASS and runs away quickly, stopping to pick up a shiny penny on the way*
and so on and so forth. reply to their ACTION though. not the thought. that would be boring 😛
EDIT: although i dont think flaming like that would be advisable. but that wasnt a real person so ive done nothing worng... right? lol =P