In my modest opinion, teachers that denigrate students, online or otherwise, are themselves
worthy of disdain.

So stating a FACT is 'denigration' in your opinion?

I don't take delight in denigrating even the laziest of students - in fact I have worked tirelessly to help many of them. Some, ( well a FEW actually), have responded well and have made excellent progress while others remain resilient. It's the 'lazy' students with the 'screw you' attitude that are denigrated, and in my opinion, deservedly so.