Background
I've been saving for new PC for a while and should be enough in a couple of months, soon be building it. The PC's components have already been chosen and should be working for both my job and my gaming hobby.
Problem
Once in a while, some relatives or my parents's acquaintance heard about my saving through my parents and would ask about what I'm going to do with it in a conversation. When I said that I was saving for new PC they respond with something like:
That sound like a waste, you should spend it for traveling, get yourself some experience, you're still young.
Or
You can get a new motorbike with the same amount of money
(I maintain my bike very often, still in good condition)
Why would you waste so much money just for games? Why don't you save it and treat us sometimes
(I still hold small parties for my birthday and invite them...)
I usually respond with something like it's not just for games but for my work too, I'm not spending all my saving for it (about 50%-60%) or sometimes when the conversation getting heated I just keep silent.
While I understand the importance of saving and won't spend all of it for my PC, some of these still irritated me and kind of angry when someone's hobby like traveling, party,.. is better than my gaming hobby. I do appreciate the thoughtfulness of elders/former generation for me about saving for the future. That's why I always avoid response with something sound arrogant like: "It's my saving/hobby/you won't understand."
Question
How to response to double standards elder relatives/acquaintance about my saving for a new PC without looking like an arrogant/disrespectful person?
Goal
I wanna help them understand that this PC is necessary for my work and maybe also understand gaming is my hobby and should be treated like any other hobbies.
They're kind of my elders or same age/generation of my parents so it's not very wise to disrespect, especially where I come from.