someone who is always teasing people: Johnny, don't be such a tease - leave your sister alone! slang disapproving someone who enjoys causing sexual excitement and interest in people she or he does not intend to have sex with

Tease, in the sense of "make fun of," can refer to cruel statements but also affectionate or harmless ones, which may be taken in good humour by the recipient. By contrast, taunt only refers to cruel statements, as does mock unless qualified (e.g. gently mock).