First, cut it with the R-word, and stop looking for validation with strangers on the Internet. You won’t gain anything from it, doubly so if you’re posting incorrect info.
That said, it’s okay not to know something, but first you need to acknowledge that you don’t know, then take the time to acquire said knowledge if you think it will be useful down the road. Trying to be right all time time at any cost is not going to help you, use that energy to actually learn something.