rude mother...

My BF of 3 years has a mom who's a bit rude ...or idk maybe feels jealous idk...
I recently found a place with my BF to move in to. 
We're fine were doing great 
We have a lot of amazing things planned for our future 
But there's one thing that's really kinda bothering me and making me feel bad.
My BF and I stop by his mom house maybe once every other week . 
I always ask her how's she's doing or ask her about her 3 year old.... She simply ignores me 
I understand one can have their place as they want but her place is a mess and just disguising to be in since there's trash everywhere in the house . 
She's the same with my bfs brothers gf we try talking to her and she ignores us
She wants us to clean her house and yet continues making a mess and finds it funny when we have to still pick up for her. 
She doesn't try to hold a conversation only with her sons 
She makes rude comments like .. I wish you would have a blonde girlfriend not a brunette 
Blondes are gorgeous 
Comments like that ignore it but it's annoying ad that she wants us to clean her house 
And change her 3 year old when that's her kid she never give her a bath she's always messy 
What should I do ?!