LeBron was fined during the playoffs last year for flopping, as were David West and Lance Stephenson. Chris Paul was warned for flopping earlier this year. James Harden was warned and fined for flopping this year.
Rondo's flop was certainly deserving of a warning, because it was a flop and a blatant one, at that. I get that you're Celtics fans here, but you would most certainly be calling that a flop if Teague had pulled what Rondo did. Just like Sully earlier this year, Rondo flopped. No biggie, not like he was fined this time.