Mom is rude

My mom and I were at the playground with my 2 year old. There comes a lonely 80-something lady. She began talking with us and telling a little of her story how she left her apartment and living now with her daughter. My mom, then starts mumbling in Spanish how she was a loser since she didn't own a house and pretended to be occupied with my toddler. I found her behavior so rude and ignorant!!! I ignored her remarks and later said to her that was uncalled for, her response was "oh who cares I'm just making some fun" I didn't want to cause an argument but I'm not sure why she thinks that's ok. Besides that, she's overbearing and I constantly have to explain myself my parenting or other things. She always has to put her 2 cents whether I want to hear it or not. She demands to spend time with my toddler alone but I don't think she has the endurance to keep up because she does very little with her . I love my mom but I find her demeanor toxic and she does little to reach out. I feel a bit guilty for judging her this way but I also feel exhausted from her negativity and I was appalled by her behaviour. I'm not sure if I'm right for being so judgy of my mom