Actually, that isn't why you'd be excluded. No one chooses a jury based upon that criteria. They might exclude someone from an individual case because of a particular topic on which one has strong opinions or a subject or parties with which a particular potential juror has had experience. But for someone to be permanently excluded, I'd think it would have to do more with instability and an inability or outright refusal to weigh facts in an unbiased manner. I don't think that is anything to be proud of at all. People who avail themselves of the court system rely upon jurors to assist them. By refusing to participate, you deny them recourse. Better watch out. I said they didn't trust him. It sounds like we are in agreement.
While the system is, certainly, less than perfect, I've yet to come across one I believe is better. You?