I'm sorry you feel ganged up on and bullied @TenLittleSweetWrappers It's not nice to feel like that, and it can appear - when many people are disagreeing with you, don't like your opinions, and start ignoring you - that you're being bullied.
However, after going through the thread in question, I don't think it was the case on this occasion, I think people were just getting annoyed. I don't think calling people flag shaggers is particularly nice, and it raises my hackles when someone says this, just because someone isn't left wing, and may like to fly an England flag. So that would have got my back up if I'd been on the thread. (Although I do agree painting them all over town/on traffic islands etc is a bit ludicrous!)
As has been said, it's poor form to hop on a thread (for example) where people are saying how it would be a good thing if Nigel Farage was Prime Minister, and start attacking people, accusing them of being thick, racist, flag shaggers etc. Or to go onto a thread about being an atheist, and tell people they're wrong and stupid to not believe in God. Or to go onto the childfree board, and tell posters they won't know love until they've had a child, and they'll 'change their mind eventually.' Or to go onto the Christian board and tell people they're daft for believing in God, and call God the sky fairy and so on...
Even if you don't share the views, it's pretty rude to plop onto a thread and start being combative with the posters on there.
I'm guessing MN didn't tell you to stop posting on the thread. More like 'feel free to hide the thread.' I doubt they would ever tell you to stop posting.
Also, I didn't see people telling others to ignore you, just someone saying 'posters are free to not engage with any given poster.'
As I say, I'm sorry you feel victimised, and I hate pile-ons, (and some posters did have a go at you,) but I think you're in the wrong here, and most of the posters were just being defensive, and actually had some valid points, as you were being quite argumentative. No need to leave the site though. Have a break for a few days and then come back... 