Examples:
"Be kind" = shutup and validate me as per brave and stunning Schofield cheating on his wife
"Be kind" = shutup and don't ask too many questions as per University at the centre of the UK Coronavirus outbreak releasing lots of stories to the press about discrimination faced by Chinese students but failing to tell the students/public that the patient was in student accommodation
"Be kind" = shutup and let my virtue signalling continue unhindered as per many commercial organisations and private individuals happy to preach and pontificate about what others should do in terms of their treatment of children/the environment/people with red jumpers none of which affects them or requires them to alter their own behaviour.
But mostly, it means shutup.