Rose McGowan -- BLASTS RAY RICE COSTUME ... 'Those People Are Repulsive'

Rose McGowan is not amused by the guy who decided to dress up as Ray Rice for Halloween -- telling TMZ Sports anyone who tries to mock that situation is downright "repulsive."

The actress was leaving the Arclight theater in Hollywood on Tuesday when we asked about the photo burning up the Internet -- featuring a man dressed as Rice carrying around a blowup doll that's supposed to be Janay Palmer.

The pic first surfaced on Reddit this month -- along with the caption, "Ladies were falling for my friend's Ray Rice costume."

Of course, Rose isn't the only star who's pissed about the situation -- but the question remains ... will the public outrage actually detour people from dressing up as Rice for Halloween??? We'll see ...