Hmmmm I personally would be a bit peeved if my DH told me off for ordering pizza or told me I had to cook a meal instead, if it wasn't something I was doing regularly - ie more than a few times a month, and my diet was generally ok and I wasn't at a weight that was affecting my health. But that's a lot of 'ifs' so it's hard to know whether you're being reasonable or not.
I would also be a bit peeved if my DH got funny about me watching the news, even if it was coverage of something unpleasant. I woke up the other morning and DH was watching the news about the beheading next to me in bed though, so obviously I am different to you in that respect, in that while I don't want to actually see it cos I'm squeamish, I do understand why people would.
Porn, that's between you two, every couple is so different and I think you have a right to have that stance.
18 films - really depends. If he's watching a lot of torture porn type stuff then I might be a bit 'really?' but if it's part of a varied film diet then I'm not that fussed, some people like to get a fright. I would feel a bit weird about a blanket ban on 18 rated films, because there is a wide variety of them and it would seem a bit silly to say they're all worthless.
For me, you do sound a little bit controlling. But everyone is different and since you're worried about it, you might be picking out examples that sound worse than they are, as well - it's hard to tell.
When he says you're being controlling, does he say it in a nice way? Or is it something you row about? I have some bad habits and my DH does remind me of them, but not in a mean way, just friendly-like and I find that helpful. But it's tricky because you don't want him to end up with a get out of jail free card, where you're so frightened of being like your mum that he gets to hold it over you like a weapon.
I'm terrified of ending up like my mum too, but I do sort of know when I'm doing it (sometimes I don't like to admit to it, which is part of it) and I just work really hard on being honest with myself - to recognise the behaviours that might be a problem and think really hard about whether they're reasonable or not.
Also, nobody is perfect! Everyone gets funny about things and as long as you're both willing to discuss disagreements, and come to compromises, then that's ok, I reckon.