If he means tan he should say tan, if he means blue he should say blue, if he means light skin then he should say light skin and not tan.
Because something =/= something else
But how many tan heads are there as opposed to light skin? You obviously knew what he meant when he said it, even if you corrected him, but he got his point across.
Also, something can mean anything else. Take awesome for example. We say things like, "That hot dog was awesome." Now, if we were using awesome in the literal sense of the word, it means we would have an overwhelming feeling of reverence, admiration, fear, etc., produced by that which is grand, sublime, extremely powerful, or the like. So basically, we'd have to fall on the ground crying or something because every bite was so awesome. But we don't. The hot dog just tastes decent, yet we call awesome.
I basically stole the hot dog thing from
Izzy Izzard, but you get the point.
In conclusion, words exist solely to help communicate ideas. If you understand the idea he's trying to get across, why question the method of how he did it?
But yea, I hate those light skin heads (That sounds like I'm talking about national socialists).
On a side note, I'm almost done with my project. I looked up stable mech joints online and found some that might work. All my previous ones were to weak to support the build.