Lady Gaga performed a medley of 10 hits by David Bowie during the Grammys on Monday. But Entertainment Weekly reports the late musician's son may not have been bowled over by the tribute. "'Overexcited or irrational, typically as a result of infatuation or excessive enthusiasm; mentally confused.' Damn it! What IS that word!?" filmmaker Duncan Jones tweeted shortly after Gaga's performance. The "somewhat cryptic" tweet—the dictionary definition of "gaga"—could be seen as an "expression of distaste," according to NBC News. The responses to Jones' tweet seem to take it that way, with Gaga fans calling him "cruel and mean spirited," "terrible," "rude," "condescending," and "passive aggressive." Others pointed out that Jones—as Bowie's son—might be entitled to his opinion. (More Lady Gaga stories.)