C'mon hippy, you're using the word "feminist" the way the red-tops use "Islamic", without even their begrudging tacking-on of words like "fundamentalist" or "militant".
I'm sorry you had such a bad experience with your former partner. People can be shits, not because they're male or female or feminists, but because they're people. I'd call myself a feminist too, as long as women continue to struggle for things like equal pay for equal work. I also (as per previous post) support men's rights not to be shoved into damaging stereotypes, any more than women should be.
For those who say "yes but what's best for the children?" I couldn't agree more. But there are organisations who support children's rights, like NSPCC, NCH, Barnardo's, Childline, etc, and a fine job many of them do.
I worked for a children & families charity myself, and I remember many impassioned debates about the issues of fatherhood, from family centres who wanted to exclude male carers to make the building a "safe place" for bullied women, through those who said "of course fathers have equal access to our services" – although funnily enough, none seemed to avail themselves of this. Weird feelings of deja vu on the second position, not that long since we heard the same about people from minority ethnic groups ...
... but I digress. The important point is, children should be given the choice but it shouldn't be either/or, choosing to live with one partner shouldn't mean they can't see the other. Also, that choice needs to be revisited at regular intervals; what a 5-year-old wants may not be what a 8- or 10- or 15-year-old wants. And they shouldn't be emotionally blackmailed or made to feel disloyal by the custodial parent, if they want to continue contact with the other one.