Kek my grandfather is like this. We, his own family, can suggest a million sensible things to him but of course we are all wrong, stupid, stop talking to me, blah blah blah. But then he will go and meet some bitch at the park who will tell him about this product at the grocery store, and he will go and buy it that day and then try to force us to like it, too.
Or he will compliment the fuck out of the neighbor's yard, how pretty it is, oh look at how they did this and that, and then I look out the window to see what he is gushing about and it is the same cookie cutter grass + half-dead palm trees + costco solar lights combo you see all over the neighborhood.
I don't know if there is a proper term for this kind of personality but in my own experience dealing with someone like this, your mom is an asshole, just like my grandfather who tried to force our dogs to be vegan because so and so at Walmart told me so!!!!
Just be glad you are not this stupid.