I am sorry to hear this. People can get very funny about the amount we do for hamsters. My OH grumbles away about it sometimes but then he just gets used to it
Giving you hate isn't very nice though. 6" of bedding is fine. I hope things settle down soon. Count to 10, try and keep off the subject a bit and don't react - just get on with looking after the hammy now and hopefully they'll soon calm down.
The comment I often get is - those hamsters get more attention than me!