Originally Posted by semtex

Is it rude to tell complete strangers that they're idiots based on comments you see them leaving on the Facebook pages of mutual friends? For example, let's say I see Nogood change his Facebook status, and a bunch of his friends -- who are complete strangers to me -- leave comments that make me think they're morons. Is it rude of me to chime in and say 'hey so and so, you're obviously a total mongo'?