What rubbish. Which mesorah do you speak of ? Sitting and learning all day and living off government funding isnt our mesorah.
Who decides what dress code is jewish? did the jews at har sinai wear black hats ?
I'm not the right guy to defend frum people. But let's not make this too hostile. I don't know how to satisfactorily answer your disliking of people sitting and learning while being supported by the government. But it has to do with frum people's belief that learning is extremely important. Therefore they feel like they are giving something in return for the government's support.
And in regards to dress code which was the original topic you had a problem with. Dress code is part of halacha, so I'm not sure what you mean by who decides dress code. A smach to the custom for wearing a uniform (black hats) is from mitzrayim where frum people believe they didn't change the way they dressed.