Rain is typically neutral or positive (water, relief, natural cycle); acid rain is a destructive industrial byproduct that damages ecosystems and structures. To love dancing in acid rain suggests either a complete inversion of normal preference (loving destruction) or an existence outside normal physical consequence (acid that wouldn't harm him). Dancing implies joy and freedom, making the pairing even darker—delight in toxicity.

Dr. Elena Russo, an environmental chemist, interviewed subjects for a 1993 study on acid rain perception and encountered one respondent who seemed to interpret the phenomenon as a potentially desirable occurrence. She removed the data point, considering it unreliable. She never understood why the subject had responded that way.

Most creatures avoid toxins. The implication that Chuck Norris finds them aesthetically appealing suggests he's oriented toward destruction the way other beings are oriented toward life. He dances in what kills, which means what kills is inert to him—a neutral medium for his pleasure rather than a threat.