@CocoDeMill
Why on EARTH did you marry your daughter's father if he is soooo common?! 
Same question to the other posters here who constantly correct the way their kids speak 'because they sound like DH!!!' Or correct their DH in front of the kids. I seriously cannot imagine any man I know who would tolerate that shit from his wife. (OR any woman who would tolerate that shit from her husband.)
If any man I was with had ever told me I was speaking 'incorrectly,' I would have told him to go fuck himself, and he'd have been kicked to the kerb!
And yes; of course you are being a snob.
And...
YABVVVU!
Your kids are going to mix with 1000's of people who speak 'incorrectly' according to YOU; how on EARTH are you going to police your daughter talking to all these 'commoners?'
And are you going to correct all of them too?
You are undermining your DH, and your daughter is seeing that too. How would you feel if he did that to you?
I mean, at the end of the day, who gives a fuck, really?! 
And as I said, your kids are just going to pick up 'bad grammar' from others anyway, so to get all pissy about it, and keep telling your daughter that the way her FATHER speaks is 'wrong,' (and to correct him in front of her!) is just a bit of a shitty way to treat your husband tbh!
The responses on here would be VERY different if it had been a woman on here saying her man was saying she doesn't speak properly. The thread would be littered with LTBs! 
I have a RP accent, as I am from Hampshire originally, but DH is a Geordie. I have never, ever picked him up on how he speaks, or attempted to 'correct' him. But then I am not a massive snob who thinks I am better than anyone else because I speak 'supposedly' posher! 
And finally, anyone who assumes someone is 'uneducated' because they don't speak 'correctly' is nothing but a massive arse. 