If I know someone is overly aggressive - I won't play if they are in the pot unless I know pretty much I'll win it. I've typed in "animal" sometimes and for some reason they back off. I've seen others type in "we're gonna call ya". Do they think we don't know what they are doing? Do they think we really think they have a monster hand every time? I think not baby puppy. Hmmm....
The advice at the top isn't especially good in online, because its hard to see their reaction. And like Smarts says - many are just waiting for a chance to pounce. Grrrr.