I wonder why people feel the need to downvote somebody for not being sure whether this special unit system has some feature or some other feature. I didn't say

I wonder why people feel the need to downvote somebody for not being sure whether this special unit system has some feature or some other feature. I didn't say it's stupid or anything, I wasn't trolling, I just have no idea, I'm not using it. For all I know 12 feet could be some unit I never heard of. Do people really have to be fully acquainted with the US culture and/or have done full research on Wikipedia before asking a question for them to be taken seriously?