Exactly Peter!
I can't imagine ever wanting to ignore every single thing any one poster may have to say.
We all make mistakes, that's why they put rubbers on the end of pencils.
But very few posters are complete idiots.
I may take issue with something someone has said, but that doesn't mean they are never ever going to post anything ever again that I want to read - they may come up with something else in ten minutes, or ten days, or weeks, but to 'ignore' them loses that opportunity for ever.
The old-fashioned way remains the best - if you don't like it, take no notice of it.