That's not an age or experience thing. People can be jerks at any age or level. Good engineers do not equate illiteracy of the codebase (unfamiliarity) with ineptitude. Good engineers educate without contempt. On the flip side, many people come into an organization questioning why or how things are done. Often, the current product is a ball of inperfection and compromises. Spend 2x more time reading the code than asking questions. Understand why a fence was put there before you tear it down.