I always interpreted "Bros before hoes" as meaning something along the lines of "Do not risk a valuable friendship just for the chance to get laid" and I think that is valid and meaningful advice for life. Sometimes our sexual desire leads us to do stupid stuff that - were we calm and reasonable in the moment - we would recognize as such. To have a maxime like that is helpful to remind oneself to that quickly when it is important.
If it is interpreted as "Your male friends are always privileged, even compared to your wife or best female friends" I deem that unsound, but that interpretation is not very charitable.
"Fries before guys" I have never heard before, but I guess it is just a gendered equivalent?