I guess that if people say to me that they don't care about my feelings (or they otherwise show me that) then I back off from the relationship. Basically... There isn't much point being friends with someone who doesn't care about your feelings... If that happens with kids or someone where you can't simply remove yourself from them, well, perhaps there are different degrees of removal.

I guess what the thing to do is depends quite significantly on the particular situation. Maybe it would help a little to look at some of the occasions where you feel that your boundaries weren't respected and to have a bit of a think / brain storm about different things that one can do from there?

It surprises me sometimes (when I was doing role play stuff in group) that there are strategies and I thought 'that will never work' and yet when I gave it a go... It did. Remarkable... I think that sometimes one needs to figure it out on a case by case basis, though.