Thanks! it's in main areas it happens. I'm in Manchester. I have friends who bike on a night in the city centre and have never been harassed. The only difference is, they are male and I am female. I don't go into the centre much at all. I think I might only bike through when i am with one of my friends as I have been lucky so far to have not been hurt by these guys acting like this.
I'm Manchester way too & have had the odd idiot in the city centre on the way home from a night out etc. I get rare similar stupidity cycling home from work late afternoon early evening too - and school kids do seem to be a particular PITA for us on bikes.
Whatever the council might like to say, we're still not a particularly cycling friendly city.
I've been riding a long time & as a bloke no doubt do get viewed differently by the knuckle draggers, but even compared to other guys, I don't seem to get/feel the aggro and intimidation others complain of. Maybe its a thicker skin, maybe its riding style: looking confident, decisive, not kerb hugging, steady line, eye contact, use my voice when necessary - polite but firm. Easier said than done and I've no idea of your experience but from your opening post you sound quite new to this type of riding. Friends would be good for moral support and confidence building. Find a good bike oriented coffee shop (Popup bikes near Victoria station for one- great place) have a chat with the staff & see if they know people local to you doing similar time rides, I'm no fan of Critical Mass riding but you could take part in things like that (last Friday in the month I think but not sure what time or from where), you may find confidence in numbers, moral support, advice on different routes, tips and tricks on dealing with morons & maybe people who live somewhere close who could buddy up with you. GMCC meetings at Friends Meeting House, 1st Monday of the month, friendly people mainly south Manchester based & all regular bike riders. Another south Manchester based one is
http://plattfieldsbikehub.org.uk/
I'm sure if you posted on here if there was a specific event or something going on you may get a fellow rider, there's a few female Mancunian cyclists on twitter , maybe facebook too but that's not my thing really.
You will always end up encountering occasional morons on foot, in cars and on bikes but I hope that they don't put you off, there is still so much more good to cycling, even in Manchester

than there is bad.