Any time there’s a gauntlet involved, you know it’s probably bad.

Entourage creator Doug Ellin is vowing to put a stop to some insensitive on-set racial and gay slurs, after one of the show’s stars complained.

Rex Lee, who plays Ari Gold’s lovable but degraded assistant Lloyd, has complained that “certain members of the crew occasionally make fun of his ethnicity and sexuality on set,” according to TMZ.com.

After Lee’s admission, the show’s creator Doug Ellin told TMZ he’s “shocked and horrified” to hear about the situation and “will be speaking to everybody before we start filming again in March. It’s not something condoned or acceptable.”

Ellin also told us he already spoke to Lee — and during the convo, Rex re-confirmed that crew members had made “insensitive gay jokes.”

Ellin claims he’s now going to lay down the gauntlet, telling Rex if it happens again, the culprit will be fired.