My experience working at a large law firm (at the time, the biggest one in San Francisco and perhaps all of California) was many years ago but I have a feeling that some things haven’t changed: the unspoken but clear ways in which partners displayed their wealth, such as the size and location of their houses and the cut and quality of their clothing.
Also from many years ago, and I hope this doesn’t still happen, but it might: the law firm partner who sneered at me when I was interviewing for a position and he noticed that I had worked as a secretary after college before starting law school.
Anyway, there are some people who will notice income differences and even point them out, and there are others who won’t. Developing a thick skin helps.