53-year-old Mary Ann Lannon has lived with her cousin in Clearwater, Florida for the last five years.  And earlier this week, she lost it when the cousin wouldn’t stop blasting the same song over and over again on a loop.

It happened around 12:15 in the morning on Tuesday.  And the song she freaked out over was . . . Chic’s 1978 disco hit, Le Freak.  (It’s the one where they sing “freak out” over and over.)

Mary Ann shoved her 64-year-old cousin into a makeshift tiki bar they’d set up, and it collapsed.

Her cousin fell through the bar . . . landed face-first on a speaker . . . and ended up with a black eye.

Cops arrested Mary Ann for domestic battery, and she’s not allowed to have any contact with the cousin for now.