Flo Rida: My So-Called Ex-Assistant Is a Thankless Parasite

No good deed goes unpunished -- at least according to Flo Rida's lawyer, who claims the so-called ex-assistant that's suing the rapper is an ungrateful freeloader who took advantage of his generosity.

TMZ broke the story ... some woman named Mahogany Miller filed a lawsuit against Flo Rida, claiming the rapper worked her to the bone last summer for a paltry $3.08 an hour. Miller claims she confronted Flo over the low wages, and he fired her.

But Flo's lawyer Sandy Becher claims she's delusional -- telling us, the girl was never officially hired as an employee in Flo's office ... she was an unpaid volunteer, who begged to work for him as a first step in the music biz.

According to the lawyer, she was unqualified for an official position, so Flo took her under his wing as an intern-type worker -- occasionally paying for her lunches or gas money, but nothing was ever guaranteed.

What's more -- Flo's lawyer says the rapper didn't fire Miller because she asked for money ... he fired her because her "behavior was inappropriate for the workplace environment." He wouldn't specify why.