It's extremely disrespectful to call someone a cripple because of their disability.

cripple 是名词，原指"跛子、瘸子"，在现代英语中这个词被认为带有冒犯性，属于对残疾人士的歧视性用语。现在更礼貌的表达方式是"person with a disability"（残障人士）。