Reflecting on my own experience on both sides, I can tell a generational difference.
As student, research-focused professors and some old timers made you feel unwelcome in office hours, a mixture of “you are wasting my time” and “you should have put more work on this, I’ll just give you some hints so I can send you away quick”. Many had in common being from a generation and country where university access was not so normalized and accessible to all social strata, just graduating came many times with some sense of entitlement.
Some years later and I’m the one assisting students during office hours. I could already sense some generational change, with younger professors and assistants treating students more like equals. They were exceptions of course, we had younger assistants cargo culting the worst attitude parts of old timers (fun enough they were usually from kind of privileged background, families with ties to the field or even de same department). The result was students from other groups kind-of/secretly attending my office hours and the ones from other nice colleagues.
Academia is its own kind of hell :-)