well he has done and not had the piss ripped out of him. raised eyebrows, yes i am sure there were a few, but no-one outwardly taking the piss out of him and if they did they would be politely told where to go by me, or my dp.
and one thing about my 4 boys, they may bicker and squabble like all kids come, but hell would freeze over before one of them stood by and let another of them be 'bullied' or picked on.
mine are 12, 9, 6 and 3 and the elder son also went through a stage of liking more 'girly' things and had purple trousers etc, it simply wasnt a big deal.
and ds3 has also taken doll/cuddly animals etc to parties, out to the park and amongst his friends there has not been an issue, thankfully at 6-7yrs of age they are STILL children! and children play with dolls and cuddly toys. i have actually had POSITVE comments from parents that think it is good that a boy is being 'allowed' to like girly things and that its nice we are 'relaxed' about it, whatever that may be.
i think its the posters saying they wouldnt allow it, whether that be for fear of bullying etc that need to look at THEIR issues cos your averge 6/7 yr old wouldnt care. i just asked my 9yr old what he would think of a boy taking a doll to a party, even one his age and he cant see the issue with it, tho he did say if its a lazer quest party it would be harder to turn around and play if you had to carry the doll, then said but as its not a real baby it wouldnt matter if you dropped it i suppose 
and ds3 will be 7 in dec, he is having a TEDDY bear party, they are making and dressing teddies, is that too 'girly' (not at the hideously overpriced bear factory, at home with kits from online so he can have group of 7 friends and it wont break the bank!)
i really find it sad that people can be negative about a young boy simply wanting to play with a doll. there wouldnt be the same issue if it was a girl playing with tanks/guns/football etc.