Patrick Mahomes' Fiancée Says She's Being 'Attacked' After Champagne Celebration

Patrick Mahomes' fiancée is clapping back at the hate she's gotten for making it rain champagne after the Chiefs' big overtime win ... saying anyone who has an issue with her celebration is a big loser.

Brittany Matthews was criticized by some on social media for uncorking a bottle of bubbly inside her suite and spraying it all over fans at Arrowhead Stadium ... with some pointing out the possibility some spectators may not have wanted to be drenched in alcohol in the freezing temps.

Others also claim that the celly might have been a bit excessive -- despite the game being incredible -- considering it was the divisional round.

Matthews responded to the backlash on Twitter this week ... saying she's sick of being ridiculed for her every move.

"I just wish I could do what I want without getting attacked every week," Matthews said.

When another user replied by saying anyone against the celebration has "clearly never won anything before" ... Brittany replied, "Accurate."

For what it's worth, several members of Chiefs Kingdom came to Brittany's defense ... pointing out she has every right to celebrate how she wants.