I'm going to get flamed for this, but so be it. And before I write further, I wish to make the point that I am not saying ALL TAs are like this, but I have met plenty who are, and some of them friends This is my personal view, as a parent, based on experience, and I have five children. As a family, we have been involved in four schools.
It used to be that teaching was a respected profession, and rightly so. I know teachers are doing the teaching, but how can they teach effectively when they have TA who is 'correcting' correct answers? I believe part of this problem is the sudden realisation that training as and becoming a TA is convenient for many mothers as it fits in with school hours (and their own children may be at the same school) and school holidays, and anyone can go for it... I know a number of mothers, and not all in the local area where I live, who out of the blue decided that becoming a TA would be a good idea once their children were all at school, even though their grasp on grammar (speaking), spelling, basic general knowledge and basic maths (the latter often by their own admission) was pretty poor.
And it not only TAs. I had an acquaintance who got a bunch of Ds and Es at GCSE level (we are in late 30s), achieved a low result on a 'degree' course at a ropey former college, and is now teaching children in a primary school, despite having the most appalling grasp on English and being barely able to add up herself (I worked with her for several years, so I know). When she got her job, I am sorry to say I was glad she wasn't going to be teaching at the school where any of my children were going to be.
I cannnot abide the 'we was', 'you was', 'I done' 'she learnt me...'(aargh!) 'school of grammar', it made me very cross when my children started to come home with this kind of thing, which they said was the way the teacher spoke (I probed, and realised it was not the teacher, but the TA, and not just one). I cracked down on it right away, saying that not everyone learnt to speak properly, but they were going to do so, and it worked. I didn't stand for this horrible laziness or the initial belief that speaking like this was trendy while speaking the correct way was 'posh' or 'nerdy' or whatever. Through my own perseverance, they grew out of it and never do it now. Yes, I even corrected, every single time, the 'me and John... etc etc' to 'John and I..' and it worked.
My point is that we as parents can't expect a school to do everything, we work in partnership with them, but I will not accept that my children should be exposed to incorrect grammar. When I received a letter this week informing me that the NHS would be in school to weigh and measure children again, it infuriated me that schools even have to 'host' this, when it is nothing to do with teaching. Let schools teach, correctly, and if I am concerned a child of mine is over/under weight/height, I will handle it.... AAARRGGH!