[Glenn.]

Originally Posted by Beso

I think you're thinking of sarcasm.

Satire.
the use of humour, irony, exaggeration, or ridicule to expose and criticize people's stupidity or vices, particularly in the context of contemporary politics and other topical issues

Yeah, but just knowing the definition isn't really the issue here, is it?
It's whether that picture actually did any of that – you know, properly used humour or irony to make a smart point.

Lots of stuff gets called 'satire' but just ends up missing the mark or comes off as a straight-up dig instead of being clever. It's more about if it works than just what the dictionary says.