I feel like a bit of a man. For me:
Men pissing by the side of the road. I have see this twice in the past few days, yet there were public loos close by. If a woman did this people would question her sanity, or at the very least think she was undignified yet for men it's considered normal.
Men going shirtless in public. Do what you like in your own garden, but why walk down the high street etc without a shirt. It's never that hot in England - in fact some much hotter climates actually have dignity laws that prohibit both men and women from even showing their arms or legs. Plus you know, sun burn.
Smoking. I hate walking behind someone who is smoking, it blows back in the face of the person behind and gives me a headache. It's unhealthy, expensive and should just be banged in public full stop imo.