I have a similar experience every time I buy any gear myself which is why I stop telling anyone how much it cost unless they are a bassist with some level of appreciation for pricey gear or a really good friend.
The truth is that they have nothing of their own to compare that kind of spending to so they don't understand it. The main culprit of this is my Dad. He doesn't have any hobbies or anything and isn't a musician so he can't understand what makes any two basses different or why mine cost so much. Recently, though he's been more cool about it and has shown some level of interest beyond "You spend too much money on bass gear!" which is nice

. When folks ask how much your stuff cost I suggest the ever popular line: "Don't worry about it."