Anyone else hates their SO's mother?

I know this is a random post to make but I'd like to know if any girls who just don't like or get on with their so's mum? Quick story short me and my partners mother never use to get along after a big row me and her had.. She always use to slate me behind my back to my partner when I can hear it, always complained about everything. Me and my partner managed to keep her house and stopping her from losing it and becoming homeless by paying the rent for a few months until she gets back on her feet and finds a job (which she still hasnt) but takes everything me and him does for granted. Anyway me and her managed to sort things out to an extent where we can have a civil conversation. My partner finds her so childish as to when they argue she threatens to kick him out and tends to throw all his things away without asking which I find disgusting and childlike. She took some of my things WITHOUT asking me on her holiday I didn't find out till couple days after when I tried to find my pair of shoes, hairbrush etc and told my partner to call her and ask her if she's taken my things and her excuse was "didn't know they were hers, if she's that bothered about it I'll buy her a new one for God sake" I was so angry as that's not the point? They're my belongings, MY possessions. Come to the point I can't keep anything of mine in the house anymore.. me and my partner always go food shopping which we spend about £65 a week on which is expensive as she never contributes or offers to pay for some of the shopping. So because it's her house but me and him pay for the shopping, pay for the rent and gas and electric and so on.. it's ok for her to threaten my own partner to chuck all his things out and do what she pleases? Do me and him have a say in anything? Because I know If I step my foot in she will tell the whole world how poor my family have brought me up and how I have no manners etc like the last time she did I stuck up for myself. Every human being she knows has told them about me. I've kept it civil with her but deep down I hate her and think she's spiteful!!!!