Ok, on the face of it, this is quite trivial and I feel a bit silly for posting. But I'm feeling hormonal and there's no DP to offload to and...in honestly, I'm a bit hurt by what DS said. Tearful even 
. Even though I know I shouldn't be.
DS (10) has form for being over sensitive and sometimes finds it hard to take a joke. So DS was putting away the socks and after I expressed doubt over something he said, he threatened to drop a pair of my socks in the cats' water bowl. So, in a jokey manner, I told him if he dropped my socks, I would hide all his pants so he'd have to wear his pink ones for swimming tomorrow (he avoids wearing his pink pants for swimming as he thinks the other boys will make fun of him). He then proceeds to drop my socks in the bowl of water.
He then starts getting all huffy about the pants comment and says he won't sort the socks. I say well if doesn't do the socks then he can't watch TV. He huffs and puffs and slams his door while my mum follows him in to pander to him.
He then fetches a drawing he did for me at school today, with the words "I love you" which i'd made a huge fuss over because I can't remember the last time he drew a picture for me. He dangles it over the bin saying "fine I'll just put this in bin then, after all that effort I made for you" etc. so I tell him to calm down and stop being so over dramatic. He said "Well I made something nice for you and get nothing in return." I told him that you don't give presents to expect anything in return and that anyway, I'd done loads of nice things for him. He says "like what?!" 
. I tried to make it jokey and light-hearted again and said "well if you've got five years I'll list them all for you shall I!" He says "ha, you see, you can't even name one!" At this point I told him, that's enough and reminded him that I'm his mother not his flat mate.
He then went into the living room with my mum where they both had a right old laugh.
AIBU to think he owes me an apology or shall I just let it drop? I know he'll say that he didn't like me joking about the pink pants but quite honestly, even though I love his sensitive side I do think he needs to develop a bit of a thick skin as this has caused problems in the past (and he's going to secondary school in September!)