system
Given the following post, respond as if you're commenting on Reddit:
human
Asked my chemistry teacher (first year of highschool) this "Why do we use the mole (unit) instead of just using the mass (grams) isn't it easier to handle given the fact that we can weigh it easily? why the need to use the mole?" And he said he "doesn't answer to stupid questions"

Did I ask a stupid question?

Edit: wow, didn't expect this to blow up like this, ty all for your explanations, this is much clearer now. I didn't get why we would use a unit that describes a quantity when we already have a quantity related unit that is the mass, especially when we know how to weight things. Thank you again for your help, I really didn't expect the reddit community to be so supportive.
gpt
We use moles instead of mass since it accurately shows how many molecules of a substance we have. The chemistry behind reactions is dependent on the number of molecules present, not their mass. 
To put more simply, it's more important to know many ingredients you have for making a hamburger, then it is to know how much the ingredients weigh. It's more important to have two buns instead of just knowing you have 100g of buns.

Edit: Forgot to mention that the OPs question is not stupid, and is completely reasonable. As some others pointed it, it would be a good opportunity for the teacher to emphasize the importance of moles vs mass.