You may feel like replying to the comment would make you look as pittiful as them, but not replying will make you look like a douche, so you 'like' it to save face.
You can also use a pitty like if someone asks you something you dont want to answer, See example two.
Not to be confused with Envy liking
Guy 1: Man kyle left a really unfunny comment on my status about how the BAFTAS are a total set up, it was too lame.
Guy 2: Aw, Dont reply man, give him a pitty like, that guys the fucking anti poon.
Your status: Just in town, Can't wait to get some food!
user comment: Hey where abouts in town are you?, I'm about and kinda hungry..
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