I think it's a good idea to have an ignore post/user button. I also think that it would be a good idea to have a "report post" button.  It might cut down on some of the squabbling.

For me, I like and get along with everyone in the Poser forum, so I wouldn't use an ignore feature. However, on the other hand, there might be some that find my posts annoying and may want to ignore me.   So I do think it's a good idea. 

However, one thing that should be noted about "ignore" is that based one experience from other forums, despite ignoring someone, if someone else quotes that person's post, you will still see it.

I post on a few other forums (not art related) and I must admit that there are a few people that really rub me the wrong way.  I just simply take note of their name and/or avatar and anytime I see a post that they've made in a thread that I'm in, I will quickly skim it and just move on and don't bother replying to their post.

I found that if you are being trolled by a fellow member, that if you just stop replying to their posts that they get tired and move on because by you not replying, they aren't able to push your buttons and it takes all of the fun out of them trolling you.

"It is good to see ourselves as others see us. Try as we may, we are never
able to know ourselves fully as we are, especially the evil side of us.
This we can do only if we are not angry with our critics but will take in good
heart whatever they might have to say." - Ghandi