Hi!
I don't know if you accept playdota.eu logs, but that seems the easiest and most convenient way.
User Kepa made a racist flame:

http://lagabuse.com/stats/game/4876085

41:48 Kepa [Allies] fucking hungarian gypsy

Replay:
http://lagabuse.com/replay/4876085.w3g

Using gypsy as an insult is racism by itself too.

Thank you for your time!

Zerind