Burnley captain Ben Mee says it was "disappointing" fans booed players taking the knee before his side's 2-1 defeat by Brighton on Saturday.
"Strong, audible and very visceral booing" could be heard as players made the gesture but it was drowned out by applauding supporters.
Players from all 20 Premier League clubs have said they will continue to take the knee this season.
"[It was] disappointing to hear the booing," said defender Mee.
"I don't know how many times we need to reiterate as players the reasons why we're continuing to take the knee.