Wow. Huh. I don't know what to say - I, too, have attended open meetings and always spoke but just to explain why I was there - a simple sentence that I wanted to learn because I wanted to better support my husband. Were you sharing or just sharing?
I've never felt unwelcome, but many didn't welcome me, either. That said, I have heard stories of some AA old-timers being very inclusive toward non-alcoholics. One story was about a wife who was frequently not included in group activities outside the home group's regular meeting times. It did hurt her feelings - the idea that this was some sort of special club that she couldn't be a member of occasionally even though her husband was.
I would be embarrassed and a little hurt, too. An open meeting is supposed to be "open" after all, right? But maybe others might have more insight than I. Still the newbie to all of this...