Just ignore him, silly fool he is.
There's always going to be that one whiny miserable sod who thinks he knows it all (and we have all come across them haven't we girls?).
How dare he try to tell you how to run your business?
What I have realised doing this is that you cannot please them all, some like this, some like that, there is always stupid unwanted criticism from the odd one here or there when there is a change but just ignore it.
Do what works for YOU and go by your gut instinct is the one good lesson I have learnt here.