Whenever i see someone cup or hold the microphone grill, I frown especially when it is done by a person that knows the negative impact it has on the sonic properties and his vocal timbre.
But i hate when the person I am correcting on handling microphone is arguing as if he knows better than i do.
To all those stubborn singers, I too-know pastors, I know-better artist, please go and do some reading on this because am not ready for that anymore.
This is now done by almost every hitherto sane person.