Elton John Says Ex Security Guard Is a Lawsuit-Happy Liar

Elton John is firing back at the former employee who's accusing him of groping and sexual harassment ... calling the guy disgruntled and litigious.

Elton's attorney says Jeffrey Wenninger is just looking for an easy payday with his lawsuit. TMZ broke the story ... Wenninger's suit accuses Elton of grabbing his genitals multiple times while on the job.

The singer's team says, "These claims are patently untrue and contradicted by numerous previous statements made by this plaintiff. We will not give into his latest abuse of the legal system."