Laurie
Yes, I breast fed in front of my Dad, FIL, BIL, Uncle and a adult male cousin.
One Christmas I fed in front of them all at once. I was feeding twins simultaneously, no cover in place I'd have needed a tent.
Not one of those men thought the occasional glimpse of breast (more frequent when simultaneous feeding) was offensive or exhibitionist or indiscreet. I'm bloody sure none of them found it sexual. 
My FIL wasn't that comfortable initially but soon got over himself. Being a clever man he realised it was his issue.
My family sat, that Christmas and at loads of other occasions with me breastfeeding my babies with out batting an eyelid. Because it's normal.
I fed in front of all my DH's friends and all my friends DH's. I fed when the postman, plumber and gasman visited. I fed when the minister came to call.
I fed (with 2 or 3 friends) at the party after our twin's Christening in front of all my male relatives and all my DH's male relatives.
I've fed in cafes, offices, shopping centres, play parks, museums and the local church.
Pretty much every man I know has seen glimpses of my breasts as I fed twins for nearly 18 months.
No one died. No one got upset, no one even commented at any time.